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Question

At what distance from O the image for the converging beam after refraction through the curved surface will be formed?


A
40 cm
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B
403 cm
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C
20 cm
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D
1807 cm
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Solution

The correct option is A 40 cm
Given that,
Refractive index of surrounding, μ1=32
Refractive index of lens, μ2=1
Radius of curvature of the lens, R=20 cm

Sign convention: Direction along incident ray is taken as +ve.

Using the formula for refraction through a curved surface.
μ2vμ1u=μ2μ1R

1v3230=13220

v=40 cm


Why this question?This question checks the basic understanding ofapplication of the formula of law of refraction oncurved surface, and the concept of virtual object.Caution : Use the sign-convention carefully.

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