1.state the principle of reversibility of light with the help of example?2.what is lateral shift?3.is refractive index vector or scalar?what are its units?what happens to the wavelenght while travelling from rarer to denser medium?

Dear student,

By the principle of light, the light makes the same angle with the normal in air as it did originally when travelling in the opposite direction.

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Sagar Singh

B.Tech, IIT Delhi

sir i want to know what will be the path of reversibility in this case ??