Question

A convex lens, of focal length 25 cm, and a concave mirror of radius of curvature 20 cm, are placed co-axially 40 cm apart from each other. An incident beam, parallel to the principal axis, is incident on the convex lens. Find the position and nature of the image formed by the combination.

Answer 1

The object, being at infinity, the image formed by the convex lens, is at its focus, i.e.,25 cm from the lens

For the convex mirror,

The final image is. therefore, a virtual image that appears to be formed (behind the convex mirror) at a distance of 66 cm from it.