On the basis of their experiment, to trace the path of a ray of light through a rectangular glass slab, students of a class arrived at which one of the following conclusions:

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Angle of incidence is greater than the angle of emergence.

Angle of emergence is smaller than the angle of refraction.

Emergent ray is parallel to the refracted ray.

Incident ray and emergent ray are parallel to each other.

answer is D.

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Detailed Solution

Concept- Refraction of light - When the incident ray of light bends or changes direction when it passes from one medium to another medium is known as refraction of light.
Ratio of Angle of incidence and angle of refraction is constant so neither is small and bigger so option 1 & 2 are false
Angle of incidence and angle of emergent is also same when we interchange the angle of incidence and angle of emergent so incidence ray and emergent ray parallel to each other.
Hence, the correct option is 4.

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