What is the principle of reversibility of light? Show that the incident ray of light is parallel to the emergent ray of light when light falls obliquely on a side of a rectangular glass slab.
CBSE OUTSIDE DELHI - SET 1 2011
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The principle of reversibility of light states that light will follow exactly the same path if its direction of travel is reversed. Here is the diagram that shows the incident ray and the emergent ray when light is obliquely refracted by a glass slab:
As seen in the diagram, the incident ray when extended (dotted line) is found to be parallel to the emergent ray. However, the emergent ray experiences a lateral shift.
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