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Q.

A point object is placed mid way between two concave mirrors placed at a distance d apart. The value of d for which object and image coincide is [Each mirror has focal length f]

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a

3F

b

4F

c

F

d

2F

answer is D.

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Detailed Solution

TO get the image at the position of the object, it should be placed at

 centre of curvature (c)

Here the mid point is at C of each mirror. So the object is at a distance

 2 f from each mirror

D = 4f

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