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Refraction through a Rectangular Glass Slab

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A combination of two prism of, one of flint glass and the other of crown glass produces dispersion without deviation. The angle of flint glass prism is 15^° . Calculate dispersion of red and violet light. (Ref index of crown glass=1.52 and flint glass=1.65) ( for crown glass=0.02 and for flint glass=0.03)

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