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Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material of the prism for red, green and blue are 46°, 44° and 43° respectively. The arrangement will separate

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All the three colours

Red colour from blue and green

Green colour from red and blue

Blue colour from red and green

answer is C.

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Detailed Solution

Angle of incidence i = 45° for all rays for red $i^{\circ} < θ_{C}$

red colour ray is refracted from the prism.
Blue and green lights takes total internal reflection.

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