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Separation between a small object and a screen is 50cm. A convex lens is placed between the object and the screen in two different positions and a sharp image is formed on the screen in each case. If in one case distance of lens from the object is 20cm. What will be the object distance for the other position of the lens?

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a

30cm

b

40cm

c

15cm

d

25cm

answer is A.

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Detailed Solution

In the two positions of the lens, image distance and object distance are interchanged.Image distance for one case = (50-20)cm = 30cm∴Object distance for the other case = 30cm

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Separation between a small object and a screen is 50cm. A convex lens is placed between the object and the screen in two different positions and a sharp image is formed on the screen in each case. If in one case distance of lens from the object is 20cm. What will be the object distance for the other position of the lens?