The path of a ray of light passing through a rectangular glass slab traced by four students is shown as A, B, C, and D in figure. Which one of them is correct?

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answer is B.

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Detailed Solution

Figure B shows the correct path of a ray of light passing through a rectangular glass slab traced by four students.
As we know, the refractive index of glass is greater than that of air. And higher the refractive index, the denser the medium. So, glass is a denser medium than air. Now, when a ray travels from a rarer medium to a denser medium, it bends towards the normal. Also, when a ray is refracted through a glass slab, the angle of incidence is equal to the angle of emergence.

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