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Q.

A pin is placed 10 cm front of a convex lens of focal length 20 cm and refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature is 22 cm. How far from the lens is the final image formed

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a

10 cm

b

11 cm

c

12 cm

d

13 cm

answer is B.

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1f=1fl+1fm+1fl;1f=2fl+1fm⇒fm=R2
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A pin is placed 10 cm front of a convex lens of focal length 20 cm and refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature is 22 cm. How far from the lens is the final image formed