A given ray of light suffers minimum dev...

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 the figure. The ray will now suffer

greater deviation

no deviation

same deviation as before

total internal reflection

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The correct Answer is:

There will be no refraction from P to Q and then from Q to R (all being identical). Hence the ray will how have the same diviation.

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