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Question: Answered & Verified by Expert
The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let $D_1$ and $D_2$ be angles of minimum deviation for red and blue light respectively in a prism of this glass. then,
PhysicsRay OpticsJIPMERJIPMER 2009
Options:
  • A $D_1 \lt D_2$
  • B $D_1=D_2$
  • C $D_1$ can be less than or greater than $D_2$ depending upon the angle of prism
  • D $D_1 \gt D_2$
Solution:
1051 Upvotes Verified Answer
The correct answer is: $D_1 \lt D_2$
$D=(\mu-1) A$
For blue light $\mu$ is greater than that for red light, so $D_2 \gt D_1$.

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