Question

Activity 10.7
- Place a coin at the bottom of a bucket filled with water.
with your eye to a side above water, try to pick up the coin in one
go. Did you succeed in picking up the coin?
Repeat the Activity. Why did you not succeed in doing it in one go?
- Ask your friends to do this. Compare your experience with theirs.​

Answer 1

Answer:

When water is poured then it is due to refraction of light taking place that the coin becomes visible.

Let a coin be placed in an opaque container which is not visible since the light rays from the coin travelling in straight lines are blocked by the walls of the container. When water is poured, light travels in a straight line until it reaches the surface of water, then it bends. When produced backwards this ray appears to come from the position C '. Since the point C' is at a higher level than C, the coin appears raised and becomes visible.