Question

Question From Physics....
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State The Principal of Reversibility of The Path of Light.
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Answer 1

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

Light is a collection of wavelengths that are fitted to a scale called the electromagnetic spectrum. 

I shall use visible light to talk about here, which is found in the center of the electromagnetic spectrum.  The visible light colors are red, orange, yellow, green, blue, indigo, and violet.  All these colors have specific wavelengths and frequencies.  When you speak of reversibility of light, it has the capability of reflecting off an object.  Sometimes, the light will travel back the same exact path it took to get to the object it reflected off of in the first place.  The light wave simply reverses itself. 

You can demonstrate this by holding a flashlight in front of a plane mirror, shining it straight into the mirror and seeing the light being reflected back to the flashlight itself.  Be sure to use a plane mirror (one that is flat) and not a concave or a convex mirror.