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Lens Formula

A plano – con...

Question

A plano – convex lens of refractive index 1.5 and radius of curvature 30cm is silvered at the curved surface. Now this lens is used to form the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object?

A

20 cm

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B

30 cm

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C

60 cm

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D

80 cm

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Solution

The correct option is A 20 cm
the virtual image formed because of refraction at the plane surface of the lens will be formed at the radius of curvature of the curved mirror, that is 30cm.Doing this find the object distance.
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