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A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and of same material as that of $\mathrm{P}$ are now combined as shown in figure. The ray will now suffer
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same deviation as before
When the ray suffers minimum deviation, it becomes parallel to the base of prism P. As prisms $\mathrm{Q}$ and $\mathrm{R}$ are of same material and have identical shape, therefore, the ray continues to be parallel to base of $Q$ and $R$. Hence final deviation of the ray remains the same as before.
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