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  4. 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 <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/20e4f7d19f208874d6f20c42305aab3a-.png />

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Q. 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
image

Ray Optics and Optical Instruments

Solution:

image
There will be no refraction from $P$ to $Q$ and then from $Q $ to $R$ (all being identical). Hence the ray will now have the same deviation.