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Question
Answer the following question:
Differentiate between a glass slab and a glass prism. What happens when a narrow beam of
(i) a monochromatic light, and
(ii) white light passes through
(a) glass slab and
(b) glass prism?
Solution
Glass slab: It is rectangular in shape and made up of glass. In glass slab, the direction of the incident ray and the emergent ray of light are parallel to each other.
Glass Prism: It has two triangular sides, two inclined rectangular sides, and one rectangular base. In glass prism, the direction of the incident ray and the emergent ray of light is not parallel to each other.
When a narrow beam of monochromatic light passes through:
- Glass slab: It deviates from the actual path but the direction of the incident ray and the emergent ray of light are parallel to each other.
- Glass prism: It has deviated from the actual path but the direction of the incident ray and the emergent ray of light are not parallel to each other.
When a narrow beam of white light passes through:
- Glass slab: The splitting of white light into its constituent color does not occur. And the direction of the incident ray and the emergent ray of light are parallel to each other.
- Glass prism: The splitting of white light into its constituent seven colors occurs. And the direction of the incident ray and the emergent ray of light is not parallel to each other.
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