Optics Question 638

Question: Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.25 will be

[CBSE PMT 1993]

Options:

A) 10 cm

B) 2.5 cm

C) 5 cm

D) 7.5 cm

Show Answer

Answer:

Correct Answer: C

Solution:

$ \mu =\frac{\sin i}{\sin \frac{A}{2}} $ cm



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