http://hdl.handle.net/2289/1474 Fri, 13 Mar 2026 08:47:18 GMT 2026-03-13T08:47:18Z http://hdl.handle.net/2289/2184 Title: On the diffraction of light by spherical obstacles Authors: Raman, C.V.; Krishnan, K.S. Abstract: The diffraction of light inside the shadow, thrown by a small source of light, of a sphere and a circular disc of the same diameter, was studied, with special reference to the relative intensities of the central bright spots. With the source at about 2 metres from the obstacles, with a quarter-inch polished steel ball, the bright spot could be detected visually up to 3 cm. behind the obstacle, while with a steel disc of the same diameter, with the edges perfectly sharp, smooth and circular, the spot could be traced up to 2 cm. The relative intensities of the two spots were studied at different distances behind the obstacles, qualitatively by photography and quantitatively by visual photometry. At small distances behind the obstacles, the spot inside the shadow of the sphere is much feebler than the disc-spot, however approximating to the latter as we reach farther back from the obstacles, but even at 100 cm. remaining appreciably feebler. A general explanation is suggested. Description: Open Access. Scanned from Vol.3 of Scientific Papers of C.V. Raman. Ed. by S. Ramaseshan. Published in 1988 by the Indian Academy of Sciences, Bangalore. Thu, 01 Jan 1925 00:00:00 GMT http://hdl.handle.net/2289/2184 1925-01-01T00:00:00Z http://hdl.handle.net/2289/2183 Title: Diffraction of light by a transparent lamina Authors: Raman, C.V.; Ramakrishna Rao, I. Abstract: The present Paper embodies an attempt to consider the problem of diffraction of light by a very thin plate of transparent material, bounded by a straight edge, with greater exactness than is attained in the usual elementary treatment on the Fresnel-Huygen principle. The method adopted, though not completely rigorous, bases itself on the electromagnetic theory of light, and seeks to express the disturbance in the field in the form of functions which are solutions of the equations of wave-propagation. The formulæ obtained indicate that the light diffracted by the edge should exhibit colour and polarization effects varying in a remarkable manner with the thickness of the plate and the direction of observation. Effects having the general character of those indicated by the theory have actually been observed in experiment. The theory, however, requires modification in the case of thicker laminæ, where further complications arise which are not here taken account of. Description: Open Access. Scanned from Vol.3 of Scientific Papers of C.V. Raman. Ed. by S. Ramaseshan. Published in 1988 by the Indian Academy of Sciences, Bangalore. Fri, 01 Jan 1926 00:00:00 GMT http://hdl.handle.net/2289/2183 1926-01-01T00:00:00Z http://hdl.handle.net/2289/2181 Title: Lectures on physical optics, Part I (Sayaji Rao Gaekwar Foundation Lectures) Authors: Raman, C.V. Description: Open Access. There are three lectures in this book. Lecture 1. Interference of light. Lecture 2. Diffraction of light, Lecture 3. Coronae, haloes and glories. Scanned from Vol.3 of Scientific Papers of C.V. Raman. Ed. by S. Ramaseshan. Published in 1988 by the Indian Academy of Sciences, Bangalore. Thu, 01 Jan 1959 00:00:00 GMT http://hdl.handle.net/2289/2181 1959-01-01T00:00:00Z http://hdl.handle.net/2289/2179 Title: On the total reflection of light Authors: Raman, C.V. Description: Open Access. Scanned from Vol.3 of Scientific Papers of C.V. Raman. Ed. by S. Ramaseshan. Published in 1988 by the Indian Academy of Sciences, Bangalore. Fri, 01 Jan 1926 00:00:00 GMT http://hdl.handle.net/2289/2179 1926-01-01T00:00:00Z