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What do you understand by the statement the refractive index of glass is 1.5 for white light?
In fig 4.18, name the ray which represents the correct path of light while emerging out through a glass block.
Four students A, B, C and D traced the paths of incident ray and the emergent ray by fixing pins P and Q for incident ray and pins R and S for emergent ray for a ray of light passing through a glass slab.
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(2) B
(3) C
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(i) `delta` m, the angle of mínimum devíation
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