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Q.

Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these prisms for mean rays are known to be 1.602 and 1. 500, respectively. Let the angle of prism of flint prism be 10°, then what will be the angle of prism for crown prism?

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a

12°2.4'

b

12°4'

c

1.24°

d

12°

answer is A.

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Detailed Solution

Use condition for Dispersion without deviation :(μ−1)A+μ′−1A′=0μ=1.602,A=10∘μ′=1.5Substituting this :0.602×10=0.5×A′A′=12.04∘=12∘2.4
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