Observe the following diagram carefully and answer the question given below.
Which of the following angles represents the angle of emergence?

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$∠$ PEF

$∠$ FCS

$∠$ MFS

$∠$ N'EF

answer is C.

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Detailed Solution

When a ray of light is incident on a prism, it refracts as it enters from air to glass.
It then travels in a straight line in the prism and gets refracted again while travelling from the prism to the air.

In the given diagram, we can see that Ray PE is going from air to prism, therefore, it is an incident ray.
Ray EF is a refracted ray and Ray FS is an emergent ray as it emerges out of the prism.
The angle of emergence is the angle between the normal to the surface and the emergent ray.
As we can see, the angle formed by the normal and the emergent ray FS is $∠$ MFS

Therefore, $∠$ MFS is the angle of emergence.

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