The radius of curvature of the convex surface of a planoconvex lens is 10 cm. What is the focal length of the plano-convex lens? (Here μ=1.5)
10cm
20cm
15cm
5cm
A
20cm
B
10cm
C
15cm
D
5cm
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Solution
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R=10cm;f=?
As, 1f=(μ−1)(1R)
1f=(1.5−1)(110)
f=10.05=20cm
hence,option B is correct.
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