Optics Question 576

Question: The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be

[MP PMT 1989]

Options:

A) 40 cm

B) 20 cm

C) 80 cm

D) 30 cm

Show Answer

Answer:

Correct Answer: A

Solution:

By formula 1f=(μ1)(1R11R2) = (1.51)(140+140)=0.5×120=140

f=40 cm



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