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'