A fine beam of light becomes visible when it enters a smoke filled room due to:

Correct option is D

A fine beam of light becomes visible when it enters a smoke-filled room due to scattering of light. This phenomenon occurs when particles in the air, such as smoke or dust, scatter the light in various directions. As the light passes through the smoke, some of it gets redirected toward the observer's eyes, making the path of the light beam visible.

Important Key Points:

1. Scattering of light happens when light interacts with small particles in the medium, causing it to deviate from its original path.
2. The visibility of a light beam is due to the scattering of light off particles in the air, which redirects some of the light toward the observer.
3. The effect is most noticeable in the presence of particles like smoke, dust, or fog, which increase the scattering.
4. This phenomenon is an example of Rayleigh scattering, where shorter wavelengths (blue light) scatter more than longer wavelengths (red light).
5. Scattering plays a key role in various natural effects, such as the blue color of the sky and the visibility of sunbeams through mist or fog.
6. The scattering of light is what allows us to see a beam of light in a smoky or dusty environment, but it would be invisible in a perfectly clean and clear atmosphere.

Information Booster:

• Rayleigh scattering occurs when the particles are much smaller than the wavelength of the light, and it is responsible for the scattering that makes the sky blue.
• Mie scattering, which happens when the particles are larger (like in fog or smoke), can cause light to scatter in a more uniform direction, which also makes the beam visible in smoke-filled environments.