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Question

Total internal reflection may take place if light is passing from
  1. water to air
  2. water to glass
  3. glass to air
  4. glass to water

A
glass to air
B
glass to water
C
water to glass
D
water to air
Solution
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The correct options are
B water to air
C glass to air
D glass to water
Total internal may occur only if light is travelling from denser to rarer medium.
So when light travels from water to air, glass to air and glass to water, their may be total internal reflection. Refractive index of glass is greater than of water.

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