Question

Write any two uses of plane mirrors.

Answer 1

Use of plane mirrors:

1. Plane mirrors are used as looking mirrors.
2. Plane mirrors also have many scientific uses. In most measuring instruments, a plane mirror is placed under the scale and pointer. When the pointer moves, the image in the plane mirror also moves. Now the eye is so placed that the pointer covers its image, and thus the pointer and its image coincide. Thus the eye, the pointer, and its image in the mirror are in the same line perpendicular to the scale. This helps in getting the correct reading.
3. Plane mirrors are also used in constructing periscope which is used in submarines.
4. Plane mirrors are used in solar cookers.
5. Plane mirrors are used to make a kaleidoscope, a toy that produces beautiful patterns from coloured paper, pieces of glass, or small coloured beads.