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Power and Thin Lenses in Contact

A thick plano...

Question

A thick plano convex lens made of crown glass (refractive index 1.5) has a thickness of 3cm at its centre. The radius of curvature of its curved face is 5cm. An ink mark made at the centre of its plane face, when viewed normally through the curved face, appears to be at a distance 'x' from the curved face. Then, x is equal to:

A

2cm

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B

2.1cm

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C

2.5cm

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D

2.3cm

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Solution

The correct option is C
2.5cm

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