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(a) With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray.(b) Show the lateral displacement of the ray on the diagram.(c) State two factors on which the lateral displacement of the emergent ray depends.
(a) In the figure given below, a light ray travelling in air, strike the rectangular glass slab, and gets refracted and bends towards the normal (as it is going from rarer to denser medium). Again, a change in the direction occurs when the refracted ray travelling in glass emerges into air. Here, the light ray bends away from the normal (as it is going from denser to rarer medium). We can see that the incident ray and emergent rays are parallel to each other. These rays are parallel because the bending limits on the opposite and parallel faces of the slab are equal and opposite.
(b) The perpendicular distance between the original path of the incident ray and the emergent ray coming out of the glass slab is called lateral displacement of the emergent ray. It is shown in the figure given above.
(c) Two factors on which the lateral displacement of the emergent ray depends are:
1. Angle of incidence.
2. Thickness of glass slab.
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