Optics Question 662

Question: A thin lens made of glass of refractive index m = 1.5 has a focal length equal to 12 cm in air. It is now immersed in water $ ( \mu =\frac{4}{3} ) $ . Its new focal length is

[UPSEAT 2002]

Options:

A) 48 cm

B) 36 cm

C) 24 cm

D) 12 cm

Show Answer

Answer:

Correct Answer: A

Solution:

$ f _{w}=4\times f _{a}=4\times 12=48\ cm. $



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