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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 :
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 :
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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(μ−1)
Substituting, the valuesR=−10cm and μ=1.5
We get, f=−10cm
The focal length of a combination of lenses, is given by,
f=R2(μ−1)
Substituting, the valuesR=−10cm and μ=1.5
We get, f=−10cm
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