A plane mirror is falling vertically as ssshown in the figure. If S is a point source of light, the rate of increase of the length AB is

A point source of light is placed in front of a plane mirror.

A point source of light is placed in front of a plane mirror.

A point source of light is placed in front of a plane mirror.

When a point source of light is kept near a plane mirror

A point source of light P is placed at a distance L in front of a mirror of width d hung vertically on a wall . A man walks infront of the mirror a long a line parallel to the mirror at a distance 2L as shown in the figure. The greatest distance over which he can see the image of the light source, in the mirror is

The mirror of length L moves horizontally as shown in the figure with a velocity v. The mirror is illuminated bya point source of light 'P' placed on the ground. The rate at which the length of the light spot on the ground increases is :

A point source of light B,placed in front of the centre of a mirror of width d,hangs vertically on a wall.A man walds in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown in the figure.The gretest distance over which he can see the image of the light source in the mirror is