Write two essential conditions for total internal reflection to take place in a transparent medium. Give two examples of this phenomenon in daily life.
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The conditions necessary of Total Internal Reflection are:-
1. The ray must be travelling from a optically denser medium to a optically rarer medium.
2. The angle of incidence of the ray should be greater than the critical angle of the medium in which it is travelling.
Examples:
1. On a hot sunny day, a driver may see a pool of water on a wet road.
2. In a desert, people often see a mirage.
3. A crack in a glass vessel often shines like a mirror.
1. The ray must be travelling from a optically denser medium to a optically rarer medium.
2. The angle of incidence of the ray should be greater than the critical angle of the medium in which it is travelling.
Examples:
1. On a hot sunny day, a driver may see a pool of water on a wet road.
2. In a desert, people often see a mirage.
3. A crack in a glass vessel often shines like a mirror.
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Answer:
For total internal reflection to take place (i) light must travel from a denser medium to a rarer medium and (ii) the angle of incidence inside the denser medium must be greater than the critical angle. i.e., ∠i>∠c.xplanation:
Total internal reflection happens when a ray of light strikes a medium boundary at an angle greater than a particular critical angle. There are two important condition for TIR to occur. First, the angle of incidence of the light ray must exceed the critical angle at the interface. Second, ray must travels from denser to rarer medium. The angle of incidence above which the total internal occurs is called critical angle.
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