Top 21 Indian Scientists and Their Inventions

Some Indian scientists received international recognition during their lifetimes, while others became known through the discoveries and institutions they left behind. Their work covers different periods of India’s scientific history, from early research in physics and mathematics to developments in space technology, medicine and agriculture.

For students learning about these achievements, this list brings together 21 top Indian scientists and their inventions, discoveries and major contributions in one place.

21 Famous Indian Scientists and Their Inventions

Learn which Indian scientist helped develop the country’s space programme? There are interesting answers behind these questions.

Scientist Name	Field	Invention / Discovery (Year)
C. V. Raman	Physics	Raman Effect (1928)
Jagadish Chandra Bose	Physics / Botany	Crescograph (c. 1900)
Satyendra Nath Bose	Physics	Bose-Einstein Statistics (1924)
Srinivasa Ramanujan	Mathematics	Partition Theory (1918)
Meghnad Saha	Astrophysics	Saha Ionisation Equation (1920)
Subrahmanyan Chandrasekhar	Astrophysics	Chandrasekhar Limit (1931)
Homi J. Bhabha	Nuclear Physics	Bhabha Scattering (1935)
Vikram Sarabhai	Space Science	Indian Space Programme (1962)
A. P. J. Abdul Kalam	Aerospace	SLV-III Launch (1980)
U. R. Rao	Space Science	Aryabhata Satellite (1975)
M. Visvesvaraya	Engineering	Automatic Sluice Gates (1903)
M. S. Swaminathan	Agriculture	Green Revolution in India (1960s)
E. K. Janaki Ammal	Botany	Sugarcane Genetics Research (1940s)
Asima Chatterjee	Chemistry	Anti-malarial Research (1940s)
Prafulla Chandra Ray	Chemistry	Mercurous Nitrite (1896)
Har Gobind Khorana	Genetics	Genetic Code Research (1960s)
G. N. Ramachandran	Biophysics	Ramachandran Plot (1963)
Anna Mani	Meteorology	Weather Instruments (1940s–1950s)
Kamala Sohonie	Biochemistry	Neera Nutrition Research (1960s)
C. N. R. Rao	Chemistry	Solid-State Chemistry Research (1960s)
Aryabhata	Mathematics / Astronomy	Place-Value System and Pi Approximation (499 CE)

Top Indian Scientists and Their Inventions

1. C. V. Raman

While studying light in Calcutta, C. V. Raman noticed something unusual in the light coming out of a liquid after a beam was passed through it. The scattered light contained a small amount with a different wavelength. The finding, made with the help of fellow researcher K. S. Krishnan, opened a new way to study the properties of molecules. And their work led to the discovery announced on February 28, 1928. This phenomenon later took the name the Raman Effect.

Identified that the wavelength change occurs because light exchanges energy with molecules.
Named this phenomenon the Raman Effect, announced in February 1928.
Raman effect involves a small fraction of scattered light gaining or losing energy during its interaction with molecules.
It is used to examine the composition of medicines.
Water, glass, crystals and gases can all be studied using Raman techniques.
Raman Effect is now used in Raman spectroscopy to identify chemicals and study materials.
His experiments on scattered light brought Raman international recognition, including the 1930 Physics Nobel.

2. Jagadish Chandra Bose

Jagadish Chandra Bose was born on November 30, 1858, in Mymensingh, a town now located in Bangladesh. His father, Bhagawan Chandra Bose, served in the British administration and wanted his son to understand Indian culture and languages.

Radio waves and plant responses may seem like two unrelated subjects, but both formed part of Jagadish Chandra Bose’s scientific work. His experiments with plants led to the development of the crescograph, a device designed to measure their extremely small movements and growth.

Designed the crescograph to detect extremely small movements and growth in plants.
Studied plant responses to changes in temperature, light and chemical exposure.
Used scientific instruments to record responses that could not be observed directly.
His work contributed to early research on plant responses and physiology.

3. Satyendra Nath Bose

Born in Calcutta in 1894, Satyendra Nath Bose developed an interest in mathematics and physics at an early age. He became a lecturer before joining the University of Dhaka as a professor. His 1924 research on light particles took an unusual route to publication: after a journal rejected his paper, Bose sent it to Albert Einstein. Einstein translated it into German and arranged for its publication. Physicists later named the statistical method Bose-Einstein statistics.

His calculations offered a different explanation of how identical particles occupy energy states.
Particles that follow this statistical rule are called bosons, named in his honour.
Photons and the Higgs boson are examples of bosons.
Einstein applied Bose’s method to atoms, leading to the prediction of Bose-Einstein condensation.

4. Srinivasa Ramanujan

Born in Erode, Tamil Nadu, Srinivasa Ramanujan grew up in Kumbakonam and developed a strong interest in mathematics during his school years. He often spent his time working through mathematical problems independently. His journey took a major turn in 1913, when he wrote to Cambridge professor G. H. Hardy and shared some of his original mathematical results.

Made important discoveries in the theory of numbers and infinite series.
His partition formulas help calculate how many ways a number can be written as a sum of smaller positive integers.
Found unusual mathematical properties of highly composite numbers.
His work on pi produced formulas that allow very rapid calculations of its value.
Introduced mock theta functions in his final years of mathematical research.

5. Meghnad Saha

Meghnad Saha entered the world on October 6, 1893, in Shaoratoli, a village near Dhaka in present-day Bangladesh. His family had limited means, but he continued his studies and eventually joined Presidency College in Calcutta. He became interested in the physics of stars and the different colours and lines seen in their light. His research led to the Saha Ionisation Equation, a major contribution to astrophysics.

His best-known work is the Saha Ionisation Equation.
It describes how atoms become ionised as temperature changes.
It helped explain the differences in the spectra of stars.
Astronomers use the principle to investigate stellar temperatures and atmospheric conditions.

6. Subrahmanyan Chandrasekhar

Before completing his college education, Subrahmanyan Chandrasekhar had already published a scientific paper. His 1929 paper dealt with Compton scattering and the new quantum statistics. Born in Lahore on October 19, 1910, he was studying physics at Presidency College in Madras when this early research took shape. A Government of India scholarship took him to Cambridge in 1930, where he began the calculations that would establish the Chandrasekhar Limit.

His 1931 calculations dealt with the maximum possible mass of a white dwarf star.
The result is approximately 1.4 times the mass of the Sun.
He used quantum statistics and special relativity to study the behaviour of extremely dense stellar matter.
His work became relevant to later studies of neutron stars and black holes.

7. Homi J. Bhabha

Engineering was the career initially planned for Homi Jehangir Bhabha, but his interests took him in another direction. Born in Bombay on October 30, 1909, he went to Cambridge in 1927 to study mechanical engineering. His growing interest in mathematics and theoretical physics led him to pursue research in physics instead. One of his important contributions was the calculation of electron-positron scattering, now called Bhabha Scattering.

Bhabha developed the mathematical expression for the scattering of electrons and their positively charged counterparts, positrons.
His research in this area was published in 1935.
Bhabha Scattering is used in particle physics to study interactions between electrons and positrons.
He also investigated cosmic rays and their behaviour when entering Earth’s atmosphere.

8. Vikram Sarabhai

Vikram Sarabhai did not see space research as an activity meant only for scientific laboratories. He wanted satellite technology to reach villages through educational broadcasts and help the country with communication, weather services and natural resource management. Born in Ahmedabad on August 12, 1919, he studied at Cambridge and worked with C. V. Raman at the Indian Institute of Science before beginning his own research institution. He went on to shape India’s space programme around practical applications of space technology.

Proposed using satellite television to deliver educational programmes to remote communities.
His plans helped lead to the Satellite Instructional Television Experiment (SITE), conducted during 1975–1976.
Initiated the project for India’s first satellite, Aryabhata, which was launched in 1975 after his death.
Received the Padma Bhushan in 1966 and the Padma Vibhushan posthumously in 1972.

9. A. P. J. Abdul Kalam

A. P. J. Abdul Kalam spent different phases of his career at ISRO and DRDO, working on India’s civilian space and defence technology. His first major national project was the SLV-III satellite launch vehicle. After its successful mission in 1980, he returned to DRDO and took charge of a much wider missile development programme. His career brought together two major areas of Indian engineering: satellite launch systems and guided missiles.

Led the development of SLV-III, which successfully placed Rohini RS-1 in orbit in 1980.
Headed the Integrated Guided Missile Development Programme launched in 1983.
The programme covered the development of Agni, Prithvi, Akash, Trishul and Nag missiles.
Received the Bharat Ratna in 1997 for his contributions to science and public service.

10. U. R. Rao

Long before satellite images became a regular source of information for weather reports and land surveys in India, U. R. Rao was working towards making such technology available to the country. His responsibilities covered the development of scientific satellites as well as spacecraft for practical applications. Born in Adamaru on March 10, 1932, he studied physics and later conducted research in the United States. He returned to India in 1966 and became one of the central figures in the country’s satellite programme.

Led the Aryabhata satellite development project, which reached orbit in April 1975.
Guided the expansion of the INSAT system for communication and weather-related services.
His work helped India build expertise in designing and operating satellites for different purposes.
Received the Padma Vibhushan in 2017 for his contribution to India’s space programme.

11. M. Visvesvaraya

Water management was only one part of M. Visvesvaraya’s engineering career. He also worked on city water supplies, industrial development, education and public administration. His appointment as Dewan of Mysore in 1912 gave him an opportunity to influence the state’s development on a wider scale. Earlier, as an engineer, he had designed automatic reservoir gates to manage stored water. He was born in Muddenahalli, Karnataka, on September 15, 1861.

Studied the flood-control requirements of Hyderabad following the 1908 disaster.
Recommended measures involving flood storage, river management and drainage improvements.
His wider engineering work included automatic gates for controlling reservoir water levels.
He later served as Dewan of Mysore and contributed to the state’s industrial and infrastructure development.

12. M. S. Swaminathan

Developing a high-yielding crop is not simply a matter of finding a variety that produces more grain. It must also perform under local soil, climate and farming conditions. This was an important part of M. S. Swaminathan’s work in plant breeding. His research helped bring semi-dwarf wheat varieties into Indian agriculture during the 1960s. He was born in Kumbakonam, Tamil Nadu, in 1925 and later became one of India’s leading agricultural scientists.

Studied the genetics of crop plants and worked on improving their productivity.
Helped introduce and adapt Mexican dwarf wheat varieties for cultivation in India.
Supported the spread of improved rice varieties as well as wheat.
His work contributed to the sharp rise in foodgrain production during the Green Revolution.

13. E. K. Janaki Ammal

Between 1934 and 1939, E. K. Janaki Ammal worked at the Sugarcane Breeding Station in Coimbatore, where plant genetics was directly connected to the needs of Indian agriculture. She examined the chromosomes of sugarcane varieties to understand their hereditary characteristics and breeding potential. Born in Thalassery, Kerala, in 1897, she went on to build a research career that covered several areas of botany. Her sugarcane studies formed an important part of her contribution to crop improvement.

Investigated chromosome numbers in different sugarcane varieties and their hybrids.
Applied cytogenetics to understand variations between cultivated plants.
Contributed scientific knowledge that supported sugarcane breeding research in India.
Also studied the genetics of plants such as eggplant and magnolia.

14. Asima Chatterjee

Asima Chatterjee devoted her research to finding useful chemical compounds in plants. Born in Kolkata on September 23, 1917, she studied chemistry at the University of Calcutta and earned her doctorate in 1944. Much of her work focused on natural products found in medicinal plants, including compounds investigated for their anti-malarial properties. Her research made a notable contribution to Indian medicinal chemistry.

Investigated alkaloids and other chemical compounds present in medicinal plants.
Conducted research on the plant alkaloids of the Alstonia and Rauvolfia groups.
Developed work on anti-malarial compounds derived from plants, including research involving Alstonia scholaris.
Received the Padma Bhushan in 1975 for her contributions to science.

15. Prafulla Chandra Ray

Prafulla Chandra Ray’s career brought together three interests: laboratory chemistry, education and the history of science. Born in 1861 in Raruli-Katipara, he travelled to Scotland for higher studies and earned degrees from the University of Edinburgh. On returning to Calcutta, he began teaching and investigating inorganic compounds. His preparation of mercurous nitrite in 1896 was among the early research achievements that established his reputation as a chemist.

Worked on the chemistry of nitrites and mercury salts.
Established Bengal Chemicals and Pharmaceuticals in 1901 to promote Indian chemical manufacturing.
Published A History of Hindu Chemistry, a study of India’s earlier chemical traditions.
Received recognition for both his scientific work and efforts to develop education in India.

16. Har Gobind Khorana

Har Gobind Khorana moved from chemistry into one of the most important areas of modern biology: the relationship between genes and proteins. After completing his early education in Punjab, he pursued advanced studies at the University of Liverpool and worked in research institutions in Switzerland, Canada and the United States. His experiments using synthetic RNA helped scientists work out how genetic messages are translated into the building blocks of proteins. This research earned him a share of the 1968 Nobel Prize.

Produced synthetic RNA sequences to test how the genetic code works.
Helped identify the nucleotide combinations that correspond to amino acids.
Later synthesised a functional gene in the laboratory, a major step in gene synthesis research.
Received the Nobel Prize alongside Marshall Nirenberg and Robert Holley in 1968.

17. G. N. Ramachandran

Collagen gives strength and support to tissues such as skin, tendons and bones. Understanding its molecular arrangement became one of the major subjects of G. N. Ramachandran’s research. Working with G. Kartha, he proposed a triple-helical model of collagen in 1954. This work came before his widely used protein-geometry plot, published in 1963. His research brought Indian scientists into important discussions about the structure of biological molecules.

Mapped the possible values of two important backbone angles in protein chains, phi and psi.
Showed which combinations of these angles are physically possible because of atomic crowding.
Provided a standard method for checking protein structures obtained through experimental research.
Published influential research on the triple-helical structure of collagen.

18. Anna Mani

Anna Mani’s scientific work focused on measurements that make weather and climate studies more reliable. She joined the India Meteorological Department in 1948 and spent much of her career working on the design, testing and production of meteorological equipment. Her interests also extended to solar radiation and atmospheric ozone. Through this work, she helped reduce India’s dependence on imported weather instruments.

Worked on instruments used to measure solar radiation, wind speed and other atmospheric conditions.
Helped develop equipment for measuring ozone in the atmosphere.
Contributed to the standardisation and local manufacture of meteorological instruments.
Received the INSA K. R. Ramanathan Medal in 1987 for her contributions to atmospheric science.

19. Kamala Sohonie

Kamala Sohonie did not limit her research to the study of proteins and enzymes inside living cells. She also wanted scientific findings to have a practical connection with people’s diets. Her investigations included pulses and Neera, a palm-based drink consumed in parts of India. These studies brought her biochemical knowledge into the field of nutrition. She was born in Indore in 1912 and completed her higher education in chemistry at Bombay University before pursuing research in India and abroad.

Analysed proteins and enzymes in food and biological samples.
Examined Neera for its nutritional value, including its vitamin content.
Studied food sources that could provide affordable nutrition to children and pregnant women.
Her work helped bring biochemical methods into the investigation of Indian dietary resources.

20. C. N. R. Rao

Nanoscience became another important part of C. N. R. Rao’s research during the later stages of his career. He investigated materials at extremely small scales, where their behaviour can differ from that of larger samples of the same substance. His earlier work in solid-state chemistry provided a foundation for studying these changes. Born in Bangalore on June 30, 1934, Rao went on to lead research programmes in several branches of chemistry and materials science.

Conducted research on the preparation and properties of nanomaterials.
Studied metal oxides and compounds with unusual electronic characteristics.
Explored materials with potential applications in energy and electronic technologies.
Authored numerous scientific publications and contributed to the growth of advanced materials research in India.

21. Aryabhata

Aryabhata’s mathematical work dates back to a period when Indian scholars were making important advances in astronomy and numerical calculations. Born in 476 CE, he wrote the Aryabhatiya in 499 CE, a Sanskrit text covering mathematics and the movement of celestial bodies. His calculations included an accurate approximation of pi and methods for working with sine values. These ideas became important references for later mathematicians and astronomers.

Gave the value of pi as approximately 3.1416, a close estimate for his time.
Presented a systematic table of sine values used in astronomical calculations.
Explained methods for calculating areas, volumes and square and cube roots.
Described the rotation of Earth on its axis to explain the apparent movement of stars.

Conclusion

When children learn about scientific discoveries, it is worth discussing how those findings relate to the world they see around them. Weather instruments, medicines, food crops and communication technology all have connections to scientific research. The scientists featured in this article offer several examples that parents can use to make these connections easier to understand.