Question

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.​

Answer 1

Answer:

Explanation:

the principle of reversibility of light states that when the light after refraction or reflection gets reversed...it will retrace its path

when light fall obliquely on a side of a rectangular glass slab...the angle between the normal and the incident ray is found to be equal to the angle between the normal of the opposite side and the emergent ray. therefore the incident ray emerge parallel to the emergent ray