Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram.

Academic Physics NCERT Class 10

The emergent ray GH is parallel to the incident ray EF, but it has been literally displaced by a perpendicular distance O'L with respect to the incident ray.

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Updated on: 10-Oct-2022

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‘A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.’ Draw a labelled ray diagram to justify the statement.
A ray of light travelling in air is incident on a parallel-sided glass slab (or rectangular glass slab). Draw a ray-diagram indicating the change in its path in glass.
A beam of light travelling in a rectangular glass slab emerges into air. Draw a ray-diagram indicating the change in its path.
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.
(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.
Tracing path of a ray of light passing through a glass slab
Is the incident ray will be parallel to the emergent ray in a glass prism?
Explain a clear diagram of the incident ray and reflected ray.
A ray of light travelling in air is incident on a rectangular glass block and emerges out into the air from the opposite face. Draw a labelled ray diagram to show the completer path of this ray of light. Mark the two points where the refraction of light takes place. What can you say about the final direction of ray of light?
Why does a ray of light bend when it travels from one medium to another?
How will you use two identical glass prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw and label the ray diagram.
A ray of light travelling in water emerges into air. Draw a ray-diagram indicating the change in its path.
In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:(a) is parallel to the incident ray.(b) perpendicular to the incident ray.(c) is parallel to the refracted ray.(d) bends at an angle to the direction of the incident ray.

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