In the given figure, \( O \) is a point object kept on the principal axis of a concave mirror \(...

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In the given figure, \( O \) is a point object kept on the principal axis of a concave mirror \( M \) of radius of curvature \( 20 \mathrm{~cm} . P \) is a prism of angle \( \alpha=1.8^{\circ} \). Light falling on the prism (at small angle of incidence) get refracted through the prism and then fall on the mirror. Refractive index of prism is \( 3 / 2 \). Find the distance between the images formed by the concave mirror due to this light.
(a) \( \frac{\pi}{20} \mathrm{~cm} \)
(b) \( \frac{\pi}{5} \mathrm{~cm} \)
(c) \( \frac{3 \pi}{2} \mathrm{~cm} \)
(d) \( \pi \mathrm{cm} \)
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