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Magnification by Thin Lenses

Question

A particle executes SHM of amplitude 1 cm along the principal axis of a convex lens of focal length 12 cm. The mean position of oscillation is at 20 cm from the lens. Find the amplitude of oscillation of the image of the particle.

A

2 cm

B

2.6 cm

C

1 cm

D

2.3 cm

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Solution

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$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

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