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Figure below shows two rays A and B travelling from water to air. If the critical angle for water-air surface is 48°, complete the ray diagram showing the refracted rays for each. State conditions when the ray will suffer total internal reflection.

Figure shows two rays A and B travelling from water to air. If the critical angle for water-air surface is 48°, complete the ray diagram showing the refracted rays for each. State conditions when the ray will suffer total internal reflection. Refraction of light at plane surfaces, Concise Physics Class 10 Solutions.

Refraction Plane Surfaces

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Answer

Completed ray diagram with refracted rays labelled is shown below:

Completed ray diagram with refracted rays labelled for two rays A and B travelling from water to air with conditions when the ray will suffer total internal reflection. Refraction of light at plane surfaces, Concise Physics Class 10 Solutions.

Ray A is incident normally at water air boundary so its angle of incidence is 0°. Hence, the refracted ray shown as AA' in the diagram passes undeviated.

For Ray B, the angle of incidence is equal to the critical angle for water air boundary so it is partly reflected as BC' and partly refracted as BD'.

Two necessary conditions for the total internal reflection are —

  1. The light must travel from a denser to a rarer medium.
  2. The angle of incidence must be greater than the critical angle for the pair of medium.

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