A thin prism P1 with an angle 60° and made of glass of refractive index 1.54 is combined with another prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation for mean colour. The angle of prism P2 is

μ1−1A1=−μ2−1A20.54×60=−0.72×A2A2=−4.50

A thin prism P1 with an angle 60° and made of glass of refractive index 1.54 is combined with another prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation for mean colour. The angle of prism P2 is

μ1−1A1=−μ2−1A20.54×60=−0.72×A2A2=−4.50

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A thin prism P₁ with an angle 60° and made of glass of refractive index 1.54 is combined with another prism P₂ made from glass of refractive index 1.72 to produce dispersion without deviation for mean colour. The angle of prism P₂ is

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6°

1.3°

7.8°

4.5°

answer is D.

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$\begin{array}{l} (μ_{1} - 1) A_{1} = - (μ_{2} - 1) A_{2} \\ 0.54 \times 6^{0} = - 0.72 \times A_{2} \\ A_{2} = - 4 . 5^{0} \end{array}$

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A thin prism P1 with an angle 60° and made of glass of refractive index 1.54 is combined with another prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation for mean colour. The angle of prism P2 is

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A thin prism P₁ with an angle 60° and made of glass of refractive index 1.54 is combined with another prism P₂ made from glass of refractive index 1.72 to produce dispersion without deviation for mean colour. The angle of prism P₂ is