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Question

The radius of curvature of a thin plano convex lens is 10 cm and the refractive index of its glass is 1.5. If the plane surface is silvered , then it will behave like a :

A
concave mirror of focal length 10 cm
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B
concave mirror of focal length 20 cm
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C
convex mirror of focal length 10 cm
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D
convex mirror of focal length 20 cm
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Solution

The correct option is A concave mirror of focal length 10 cm
The focal length of a combination of lenses, is given by,
f=R2(μ1)

Substituting, the valuesR=10cm and μ=1.5

We get, f=10cm

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