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Question

A coin kept in a container and not visible can be viewed by pouring water into the container. It happens because of the
  1. Reflection of light.
  2. Refraction of light.
  3. Variable refractive index of water.
  4. None of the above.

A
Refraction of light.
B
Reflection of light.
C
None of the above.
D
Variable refractive index of water.
Solution
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When water is poured then it is due to refraction of light the coin becomes visible. When the light rays travel from the water medium (denser) to the air medium (rarer) it bends away from the normal due to the refraction. Therefore, an image of the coin is formed at a smaller depth causing it to be visible (as shown in the figure).
567279_282600_ans_5bb3a4a3439247b9ac173d1b792466f3.png

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