Question

What is the principle of reversibility of light with show the incident ray parallel to emergent ray

Answer 1



Sugeerthaa Reddy asked in Science

State the Principle of reversibility of light

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Daffodils answered this
43 helpful votes in Science, Class XI-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

= 1n2

sin r
sin i

= 2n1

1n2=

1 
2n1

It follows that

1n2=

1 
2n1