Optics Question 589

Question: A glass convex lens (μg=1.5) has a focal length of 8cm when placed in air. What would be the focal length of the lens when it is immersed in water ( μw=1.33 )

[BHU 1994; MP PMT 1996]

Options:

A) 2 m

B) 4 cm

C) 16 cm

D) 32 cm

Show Answer

Answer:

Correct Answer: D

Solution:

flfa=(aμg−1)(lμg−1)

sin⁡45osin⁡30o

⇒fw=32cm

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