InterviewSolution
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InterviewSolution
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A thin prism of angle `15^(@)` made of glass of refractive index `mu_(1)=1.5` is combined with another prism of glass of refractive index `mu_(2)=1.75`. The combination of the prism produces dispersion without deviation. The angle of the second prism should beA. `7^@`B. `10^@`C. `12^@`D. `5^@` |
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Answer» Correct Answer - B Here, `A_1 = 15^ @, mu_1 = 1.5 , mu_2 = 1.75, A_2 = ?` There will be no deviation for the combination of two prisms of net deviation is zero, i.e., `delta_1 + delta_2 = 0` or `(mu_1 - 1) A_1 + (mu_2 - 1) A_2 = 0` or `A_2 = -((mu_1 - 1)A_1)/((mu_2 - 1)) = -((1.5 - 1)15^@)/((1.75 - 1)) = - 10^@` `-ve` sign shows that the second prism is placed in opposition to first prism. |
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