A) From denser to a rarer medium
B) From rarer to a denser medium
C) From one medium to another of equal refractive index
D) From one medium to another of equal absorption coefficient
Correct Answer: A
Solution :
[a] When light travels from one medium to another it changes speed and is refracted. If the light rays are travelling for a less dense material to a dense medium they are refracted towards the normal and if they are travelling from a dense to less dense medium they are refracted away from the normal. 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).
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