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Dispersion of White Light by Glass Prism

Which of the ...

Question

Which of the following correctly depicts the path of a ray passing through a rectangular glass slab?

A

I

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B

II

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C

III

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D

IV

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Solution

The correct option is D IV
When a light ray enters the glass slab from air, it bends towards the normal and when it comes out from the slab, it bends away from the normal as shown.
Hence, only figure IV is following the correct path.

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