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"On the Determination of the Wave-length of Electric Radiation by Diffraction Grating" is an academic paper by Bengali scientist Professor Jagadish Chandra Bose, published in 1896 in Proceedings of the Royal Society of London (vol 60, no. 161).

The paper is an important work in the history of microwave optics and the invention of the radio. Bose himself, later Sir Jagadish Chandra Bose, was a pioneer in the field and has been named one of the fathers of radio science by the IEEE.

J.C.Bose.JPG

While engaged in the determination of the "Indices of Refraction of various Substances for the Electric Ray" (vide 'Proceedings of the Royal Society,' vol. 59, p. 160), it seemed to me that the results obtained would be rendered more definite if the wave-length of the radiation could at the same time be specified. Assuming the relation between the dielectric constant K and the index μ as indicated by Maxwell, to hold good in all cases, it would follow that the index could be deduced from the dielectric constant and vice versâ. The values of K found for the same substance by different observers are, however, found not to agree very well with each other. This may, to a certain extent, be due to the different rates of alternation of the field to which the dielectrics were subjected. It has been found in general that the value of K is higher for slower rates of alternation and the deduced value of μ would therefore be higher for slow oscillations, the longer waves being thus the more refrangible. The order of refrangibilities would in such a case appear to be somewhat analogous to that in an anomalously dispersive medium like iodine vapour.

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