The focal length of a spherical mirror is the distance between its principal focus and pole.
Important Questions on Reflection of Light
A point source of light, is placed at a distance in front of the center of plane mirror of width which is hanging vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror, at a distance as shown below. The distance over which the man can see the image of the light source in the mirror is:
| Column 1 | Column 2 | ||
| (A) | (a) | Convex mirror | |
| (B) | (b) | Concave mirror | |
| (C) | (c) | Real image | |
| (D) | (d) | Virtual image |
A ray of light parallel to the principal axis of a spherical mirror falls at a point as shown in the figure below:
If the mirror is immersed in water, its focal length _____.
| Object pin | Convex Lens | Convex Mirror | Image Pin |
| 22.2 cm | 32.2 cm | 45.8 cm | 71.2 cm |
A hemispherical glass body of radius 10 cm and refractive index 1.5 is silvered on its curved surface. A small air bubble is 6 cm below the flat surface inside it along the axis. The position of the image of the air bubble made by the mirror is seen :
