First slide

The lens

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)

Moderate

A

10.5 cm
B

10 cm
C

5.5 cm
D

5 cm

Solution

$f = \frac{R}{2 (μ - 1)} = \frac{10}{2 (1 .5 - 1)} = 10 cm$

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