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

Correct option is D

The correct answer is option (D) Scattering of light

• Scattering of light occurs when light interacts with small particles or molecules in the medium it travels through, causing the light to change direction.
• In the case of a smoke-filled room, the smoke particles scatter the light, making the path of the light beam visible to the observer.
• This is why the beam appears visible as it passes through the room.
  

Information Booster :-

• Refraction is the bending of light as it passes from one medium to another (like from air into water). While refraction does occur when light enters a different medium.
  
• Dispersion occurs when light is separated into its component colors, as seen in a prism.
  
• Reflection occurs when light bounces off a surface. While reflection may happen within the room, it is scattering that makes the beam of light visible in a smoke-filled room.