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In which diagram the angle of refraction r has been correctly depicted?
![](/assets/questions/media/145526-42774-1617637385.png)
- I
- II
- III
- IV
"
(d) IV
Explanation
When a ray of light passes through a rectangular glass slab, it gets bent twice at the air-glass interface and at the glass-air interface.
The emergent ray is parallel to the incident ray and is displaced through a distance, and the angle between normal and refracted ray is $r$.
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