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A ray of light suffers minimum deviation in equilateral prism $P$. Additional prisms $Q$ and $R$ of identical shape and of same material as that of $P$ are now combined as shown in figure. The ray will now suffer
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same deviation as before
The complete ray diagram for the given combination of prisms is shown below.
Sines, ray of light incident on prism $p$ suflers minimua deviation, bence it becomes parallel to the
base of prism $\boldsymbol{P}$. As prism $Q$ and $R$ are of identical shape and of same material as that of prism $P$, therefore, the ray continues to be parallel to base of prisms $Q$ and $R$. Hence, the ray will now suffer same deviation as before.
Sines, ray of light incident on prism $p$ suflers minimua deviation, bence it becomes parallel to the
base of prism $\boldsymbol{P}$. As prism $Q$ and $R$ are of identical shape and of same material as that of prism $P$, therefore, the ray continues to be parallel to base of prisms $Q$ and $R$. Hence, the ray will now suffer same deviation as before.
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