Q.

The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let D1 and D2 are the angles of minimum deviation for red and blue respectively in a prism of the glass. Then   

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a

D1 < D2

b

D1 > D2  

c

D1 = D2

d

D1 can be less than or greater than  dependent upon the angle of prism.

answer is A.

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Detailed Solution

δ = (μ -1) A. The greater the refractive index the higher the deviation. As refractive index for blue light is higher, the deviation for blue light will be heavier.

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