Chapter 28, Problem 25Q

To determine

If intensity of light from laser, follow inverse square distance.

Answer to Problem 25Q

Solution:

Yes, light from laser follow inverse square distance.

Explanation of Solution

Given:

Electrons orbiting inside the atom.

The light from laser is directional in nature unlike the ordinary light. A point source produces light in all direction and hence for intensity of light from the point source, the area of sphere around the point source at the centre is considered. For the light from laser, the area of square is considered since it is directional in nature.