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Question: Answered & Verified by Expert
Inside a vessel filled with liquid a converging lens is placed as shown in figure. The lens has focal length $15 \mathrm{~cm}$ when in air and has refractive index $\frac{3}{2}$. If the liquid has refractive index $\frac{9}{5}$, the focal length of lens in liquid is

PhysicsRay OpticsMHT CETMHT CET 2021 (20 Sep Shift 1)
Options:
  • A $15 \mathrm{~cm}$
  • B $-60 \mathrm{~cm}$
  • C $90 \mathrm{~cm}$
  • D $-45 \mathrm{~cm}$
Solution:
2120 Upvotes Verified Answer
The correct answer is: $-45 \mathrm{~cm}$

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