A point object \( O \) is placed at a distance of \( 20 \mathrm{~cm} \) from a convex lens of fo...

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A point object \( O \) is placed at a distance of \( 20 \mathrm{~cm} \) from a convex lens of focal length \( 10 \mathrm{~cm} \) as shown
\( \mathrm{P} \)
in figure. At what distance \( x \) from the lens should a concave mirror of focal length \( 60 \mathrm{~cm} \), be placed so
W
that final image coincides with the object-
(1) \( 10 \mathrm{~cm} \)
(2) \( 40 \mathrm{~cm} \)
(3) \( 20 \mathrm{~cm} \)
(4) final image can never coincide with the object in the given conditions
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