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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

A

greater deviation

B

no deviation

C

same deviation

D

Total internal reflection at point P ceases if the refractive index of water is increased to 5/6 by dissolving some substance

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The correct Answer is:
C
Figure (a) is part of an equilateral prism of figure(b) as shown in figure which is a magnified image of figure(c).

Therefore , the ray will suffer the same deviation in figure (a) and figure (c).
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