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The refracting angle of a crown glass prism is 6°. Refractive index of crown glass is 1.55. The refractive index of flint glass is
1.66. What must be the angle of a flint glass prism that is to be joined with the crown glass prism as shown in the diagram
so that the combination may produce no deviation?

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5.6°

3°

5°

6.4°

answer is B.

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Detailed Solution

$d_{1} = d_{2} \begin{array}{l} A_{1} (μ_{1} - 1) = A_{2} (μ_{2} - 1) \\ 6 (0.55) = A_{2} \times 0.66 \\ A_{2} = 5^{\circ} \end{array}$

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