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

(a) A

(b) B

(c) C

(d) D

Answers (1)

Answer: B

When light passes from air to glass, it bends towards the normal and when light passes form glass to air it bends away from normal. Glass slab causes the lateral displacement of a ray of light falling on it. However, incident ray and emergent ray are parallel to each other.

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