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Q.

A 16 cm long image of an object is formed by a convex lenses on a screen on moving the lens towards the screen, without changing the position of object and the screen, 9 cm long image is formed again on the screen. The size of the object is

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a

12 cm

b

14 cm

c

12.5 cm

d

10 bm

answer is A.

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Detailed Solution

this is lens displacement method, if image size for the two conjugate position of the object is I1 and I2 then object size is O is I1I2here O is 16×9=12

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