A ray of light is normally incident on one face of an equilateral glass prism. Answer the following:

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A ray of light is normally incident on one face of an equilateral glass prism. Answer the following:

(a) What is the angle of incidence on the first face of the prism?

(b) What is the angle of refraction from the first face of the prism?

(c) what will be the angle of incidence at the second face of the prism?

(d) will the light ray suffer minimum deviation by the prism?


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Salim Ahmed Kawsar

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(a) If the incident ray normal to prism then angle of incidence is 0o.

(b) In this case the angle of refraction from the first face r1 = 0o.

(c) As the prism is equilateral so A = 60o and r1 = 0o. So at the second face of the prism, the angle of incidence will be 60o.

(d) No the light will not suffer minimum deviation.

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