A convex lens is placed in contact with the plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens?
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Explanation:
A convex lens L in contact with a plane mirror M. P is the point object kept in the front of this combination at a distance of 20 cm from it.
Since, the image is coinciding with the object itself, the rays from the object after refraction from the lens fall normally on the mirror M and form an image coinciding with the object itself. So, the image is formed at the focus of the lens, So, focal length of the lens is 20 cm.
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