A thin prism P 1 with angle 4 ∘ made of glass having refractive index 1.54 , is combined with another thin prism P 2 made of glass having refractive index 1.72 to get dispersion without deviation.

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A thin prism P 1 ​ with angle 4 ∘ made of glass having refractive index 1.54 , is combined with another thin prism P 2 ​ made of glass having refractive index 1.72 to get dispersion without deviation. The angle of the prism P 2 ​ in degrees is

TestHub · Accepted Answer

For dispersion without deviation, ​ ( μ 1 ​ − 1 ) A 1 ​ = ( μ 2 ​ − 1 ) A 2 ​ ⇒ ( 1.54 − 1 ) 4 ∘ = ( 1.72 − 1 ) A 2 ​ Or A 2 ​ = 0.72 0.54 ​ × 4 = 3 ∘ ​

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