Physics
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?
Refraction Plane Surfaces
ICSE
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Answer
(a) The angle of incidence on the first face of the prism when a ray of light is normally incident is 0°.
(b) The angle of refraction from the first face of the prism r1 = 0° as the angle of refraction of a normally incident ray is always 0°.
(c) As the prism is equilateral therefore A = 60°.
Given, r1 = 0°.
Hence, taking into consideration the two conditions we get,
the angle of incidence at the second face of the prism, equal to 60°.
(d) No, the light ray will not suffer minimum deviation as the angle of incidence is 0°.
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