Question

A coin is placed at the bottom of a clear glass vessel. An observer moves
herself to a position where the coin goes just out of sight of her eyes. Keeping
her eyes in that position, she asks her friend to pour some water, gradually
into the glass vessel.
(a) What would she observe?
(b) Name the phenomenon involved in this observation.
(c) Draw a neat labelled diagram to justify your answer.
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Answer 1

Explanation:

a)she observes that the coin gradually became visible.

b) refraction

Answer 2

Answer:

(a) She observe that the coin suddenly became invisible.

(b) The phenomenon involved in his observation is refraction.