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. $
