A narrow beam of sunlight comes in through a gap in the curtains of a dusty room, and its whole path across the room can be seen clearly. What is this effect called?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Tyndall effect
The fine dust particles in the air scatter the light sideways towards our eyes, so the path of the beam is seen. This scattering of light by small particles in a medium is the Tyndall effect.