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Q.

Behind a thin converging lens having both the surfaces of the same radius 10 cm, a plane mirror has been placed.The image of an object at a distance 40 cm from the lens is formed at the same position. What is the refractive index of the lens?

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a

1.5

b

53

c

98

d

None

answer is C.

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Detailed Solution

‘O’ acts as focal point1f=(μ−1)1R1−1R2140=(μ−1)110+110140=(μ−1)210⇒μ=98
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