Q.

Total internal reflection can not take place when light goes from –

A. glass to water
B. water to glass
C. water to air
D. glass to air
Answer» B. water to glass
Explanation: For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
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