Optics Question 615

Question: A convex lens of focal length 12 cm is made of glass of μ=32 . What will be its focal length when immersed in liquid of μ=54

[MP PMT 1995, 2003]

Options:

A) 6 cm

B) 12 cm

C) 24 cm

D) 30 cm

Show Answer

Answer:

Correct Answer: A

Solution:

flfa=(aμg1)(lμg1)= (321)(3/25/41)=52

fl=fa(52)=12×52=30 cm



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