The angle between the emergent ray and incident ray when the light goes from air to glass slab is ____

$0^{\circ}$

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$45^{\circ}$

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$60^{\circ}$

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$90^{\circ}$

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Solution

The correct option is A
$0^{\circ}$

As the light ray travels from air to the glass slab, the refracted ray bends towards the normal as the glass slab is denser than the air. When the ray finally emerges out of the glass slab, the emergent ray bends away from the normal. Here emergent ray and incident rays are parallel, so the angle between them is $0^{\circ}$

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