Optics Question 626

Question: A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is

[CBSE PMT 1999; Pb. PMT 1999; BHU 2001; Very Similar to BHU 2003]

Options:

A) 50 cm

B) 100 cm

C) 200 cm

D) 400 cm

Show Answer

Answer:

Correct Answer: B

Solution:

$ f=\frac{R}{(\mu -1)}=\frac{60}{(1.6-1)}=100\ cm. $



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