Question

What is the relationship between light intensity and distance?

Answer 1

1. Light intensity can be defined as the energy transferred by light per unit area and unit time.
2. Light intensity of a point source follows the inverse square law, according to which the intensity of light will be inversely proportional to the square of the distance from the light source.
3. This is because as the distance away from a light source increases, photons of light become spread over a wider area.

Hence, light intensity decreases as distance increases and vice versa.