Physics
A ray of light incident at an angle of incidence i1 passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence i2.
(i) How is the angle of emergence 'i2' related to the angle of incidence 'i1'.
(ii) What can you say about the angle of deviation in such a situation?
Refraction Plane Surfaces
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Answer
(i) When a ray of light incident at an angle of incidence i1 passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence i2 then angle of incidence i1 is equal to the angle of emergence i2.
Hence,
i1 = i2
(ii) When a ray of light incident at an angle of incidence i1 passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence i2 then angle of deviation is minimum.
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Related Questions
Define the term angle of deviation.
How does the deviation produced by a prism depend on
(i) the refractive index of its material, and
(ii) the wavelength of incident light
How does the angle of deviation depend on refracting angle of the prism?
A light ray of yellow colour is incident on an equilateral glass prism at an angle of incidence equal to 48° and suffers minimum deviation by an angle of 36°.
(i) What will be the angle of emergence?
(ii) If the angle of incidence is changed to (a) 30°, (b) 60°, state in each case whether the angle of deviation will be equal to less than or more than 36°?