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=(1.602−1)(1.500−1)=0.6020.500⇒A=12∘2.4′