Question

(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.

Answer 1

Explanation:

(a)  When light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray as shown in the figure below:

(b) CD is the lateral displacement of the ray as shown in the above figure.

(c)  Two portions on which the parallel displacement of the emergent ray depends are:

1) The angle of incidence of the incident ray.

2) The refractive index of the glass slab.

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