A point object O is placed at a distance of 20 cm from a convex lens of focal length 10 cm as shown in figure. At what distance x from the lens should a concave mirror of focal length 60 cm. be placed so that final image coincides with the object -
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Verified by ExpertsThe correct answer is:
C
Object is placed at distance of 2f from the lens i.e. the image formed by the lens will be at a distance of 2f or 20 cm from the lens. So if the concave mirror is placed in this position the first image will be formed at its pole & it will reflect all rays symmetrically to other side.
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