a glass prism has?
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A glass prism has refractive index 2 and refracting angle 30∘. One of the refracting surface of the prism is silvered. A beam of monochromatic light will retrace it path if its angle of incidence on the unsilvered refracting surface of the prism is.
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angle of 30 degrees
one of the refracting surface of the prism is silvered
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