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Q.

A convex lens forms a real image 4 cm long on a screen. When the lens is shifted to a new position without distrurbing the object or the screen, again real image is formed on the screen which is 16cm long. The length of the object is

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a

12 cm

b

6cm

c

10 cm

d

8 cm

answer is A.

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Detailed Solution

Object size

OS=I1I2

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