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Thermodynamics

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Flicker Photometer

When the sources emit light radiations of different wavelengths, the flicker photometer is used. In this case, A is a plaster of paris disc cut into sectors and B is a white diffusing surface. Light from a source S₁ is reflected by the surface B. A is rotated about a horizontal axis while it is always inclined at an angle of 45˚ to BE. Light from the surface A and the surface B after reflection is seen through the microscope M.

The disc A is rotated and it is observed that flickering occurs in the beginning. The distance of the source S₁ from the disc A is adjusted so that no flickering is observed. Suppose the distance of S₁ from the disc A is R₁. Now replace the source S₁ by the second source S₂, keeping S fixed at its original position. Adjust the distance of the source S₂ from the disc A so that no flickering of light is observed in this case also. Suppose the source S₂ is at a distance R₂ from the disc A.

It is observed that no flickering is produced even when the sources are of different colours. If L₁ is the illuminating power of the source S₁ and L₂ the illuminating power of S₂.