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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 for mean rays are 1.602 and 1.500 respectively. Angle of prism of flint prism is 10°, then the angle of prism for crown prism will be

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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

For dispersion without deviation AA'=μy'−1μy−1∴A10=1.602−11.500−1=0.6020.500⇒A=12o2.4'
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