A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in figure. The ray will now suffer

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same deviation as before

greater deviation

total internal reflection

no deviation

answer is C.

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Detailed Solution

There will be no refraction from P to Q and then from Q to R all being identical made of same material. Hence the ray will now have the same deviation.
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