Optics Question 656

Question: In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)

[CBSE PMT 2000; BHU 2004]

Options:

A) 10.5 cm

B) 10 cm

C) 5.5 cm

D) 5 cm

Show Answer

Answer:

Correct Answer: B

Solution:

$ f=\frac{R}{2(\mu -1)}=\frac{10}{2(1.5-1)}=10cm $



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