Question

All practical mirrors absorb a little fraction of light incident on it. Due to this, when a ray of light is reflected repeatedly by a set of parallel plane mirrors, the intensity of the ray, after a few reflections, becomes :

• A. more than that of the incident ray
• B. less than that of the incident ray
• C. same as that of the incident ray
• D. equal to zero

Answer 1

Answer: (B)

less than that of the incident ray

As the mirrors absorb a little fraction of the light rays incident on them, during every reflection, the intensity of the ray decreases continuously.

So, for the given condition, after a few reflections, the intensity of the reflected ray will become less than that of the incident ray.