principle of reversibility of light
with example
Answers
Answer:It is a principle that is obviously mathematically verifiable and also useful to get a few results but to it's more like common sense or something that looks naturally correct(intuitive) .
Explanation:It's very simple to understand -
Path of ray of light is reversible or light traces back it's path while travelling in reverse direction or a ray of light can pass in either direction along the same path
Suppose if there are points A and B . Light takes a particular path to travel form A to B. If we now make light travel from B to A, it will travel along the same path.
If the medium doesn't change between the two points then travels in straight line or else it bends at the boundary where the medium changes( refraction ) . In either case light will always follow the same path while travelling from A to B and back from B to A.
It is useful to prove that in refraction through a rectangular glass slab the emergent ray is always parallel to the incident ray.
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Explanation:
The law stating that if the direction of a light beam is reversed, despite the number of times the beam is reflected or refracted, it will follow the same path.