A point object is placed at a distance of 15 cm on the principle axis of a convex lens of focal length 12 cm. On the other side of the lens, a convex mirror is placed at a distance of 20 cm from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is:

A point object is placed at a distance of 15 cm on the principle axis

1.	A point object is placed at a distance of 15 cm on the principle axis of a convex lens of focal length 12 cm. On the other side of the lens, a convex mirror is placed at a distance of 20 cm from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is:
A.	60 cm
B.	40 cm
C.	15 cm
D.	20 cm
Answer» E.

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