Four students perform an experiment on tracing the path of a ray of light passing through a rectangular glass slab. Their individual observations are: Identify the incorrect observations.

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Angle of emergence is less than the angle of refraction

Angle of emergence is greater than the angle of incidence

Emergent ray is parallel to the refracted ray

Emergent ray is parallel to the incident ray

answer is A.

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Detailed Solution

Concept: Double refraction occurs when a light beam transitions from a denser to a rarer medium via a glass slab. When it enters the glass slab, it does it once, and when it exits, it does so twice. When the emerging ray exits the glass slab, it emerges parallel to the incident beam. This is caused by the fact that the beam passes through and out of two parallel glass slabs. The proper answer is that the emerging ray is parallel to the incident beam. The angle of emergence and angle of incidence are also identical. Refracted angle is smaller than angle of incidence since it is, and it is also smaller than angle of emergence.
Hence, the correct option is 1,2,3

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