A thin prism P1 with angle 4∘ and made from glass of refractive index 1.54 is combined with another prism P2Made of glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism P2 is
A
5.33∘
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B
4∘
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C
3∘
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D
2.6∘
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Solution
The correct option is C3∘ Dispersion without deviation. (μ1−1)A1=(μ2−1)A2(1.54−1)4∘=(1.72−1)A254×4∘72=A2A2=62=3∘