A concave mirror is placed inside water its shining surface upwards and principal axis vertical as shown in figure. Rays are incient parallel to the principal axis of the concave mirror. Find the position of the final image.

A concave mirror of focal length 20cm is placed inside water with its shining surface upwards and principla axis vertical as shown in Fig. Rays are incident parallel to the principa, axis of concave mirror. Find the position of final image.

An object is placed on principal axis of concave mirror at distance of 1.5 f Image will be at

The image of an exend object placed perpendicular to the principal axis of a mirror, will be erect if

In the following figure two mirrors M_(1) and M_(2) are placed in front of each others. Both the mirrors have same focal length of 30 cm. Mirror M_(1) is concave but mirror M_(2) is convex. Distance between the two mirrors is d and their principal axes are coinciding as shown in figure. An object O is placed on principal axis at a distance 45 cm from mirror M_(1) . It is found that final image is formed on object itself. Calculate the value of d.