Sugeerthaa Reddy , asked a question
Subject: Science , asked on 14/9/09

State the Principle of reversibility of light

Daffodils , added an answer, on 14/9/09
39 helpful votes in Science

 The principle that if a beam of light is reflected back on itself, it will traverse the same path or paths as it did before reversal.
 

The principle of reversibility states that light will follow exactly the same path if its direction of travel is reversed.

Hence:

Using Snell's Law,

sin i
sin r

= 1 n 2

sin r
sin i

= 2 n 1

1 n 2=

1
2 n 1

It follows that

1 n 2=

1
2 n 1

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