A ray of light, incident on an equilateral glass prism moves parallel to the baseline of the prism inside it. Find the angle of incidence for the ray.

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60o

30o

90o

180o

answer is A.

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Detailed Solution

Concept- To determine the angle of incident ray, we create an appropriate figure that depicts all of the information in the question, then apply Snell's law of refraction of light to the data from the figure. The refractive index of air is well known.

.
Formula Used:
Snell's Law :

,
The angle of incidence for this ray
From the figure, we see
Question Image

We know

The angle of incidence for the ray i= 60o
Hence, option 1 is correct.

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