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An equilateral glass prism kept on a tab...

An equilateral glass prism kept on a table has refractive index of `mu = sqrt(2)` . It is illuminated by a narrow laser beam having power `P_(0)` and wavelength l. The path of the laser beam inside the prism is parallel to the base of the prism. Calculate change in weight of the prism due to the incident laser beam.

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The correct Answer is:
`(2P_(0))/(c) cos 15^(@)`
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