Concave Mirror

A concave mirror and a convex mirror of focal lengths 10cm and 15cm are places at a distance of 70cm. An object AB of height 2cm is places at a distance of 30cm from the concave mirror. First ray is incident on the concave mirror then on the convex mirror. Find size, position, and nature of the image.

An object is placed midway between a concave mirror of focal length f and a convex mirror of focal length f. The distance between the two mirrors is 6f. Trace the ray that is first incident on the concave mirror and then the convex mirror.

Giving reasons, the 'signs' (positive or negative) which can be given to the following : (a) object distance (b) image distances ( c) image distances (u) for a concave mirror or convex mirror (v) for a concave mirror (v) for a convex mirror