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Standard X
Physics
Refraction of Light through a Prism
A light ray o...
Question

A light ray of yellow color 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∘?[3 marks]

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left parenthesis i right parenthesis A s space t h e space r a y space i s space s u f f e r i n g space m i n i m u m space d e v i a t i o n space i n space a n space e q u i l i b r i u m space g l a s s space p r i s m space s o i subscript 1 equals i subscript 1 t h e r e f o r e space i subscript 2 equals 48 degree left parenthesis i i right parenthesis I f space t h e space a n g l e space o f space i n c i d e n c e space i s space c h a n g e d space t o left parenthesis a right parenthesis 30 degree space t h e space a n g l e space o f space d e v i a t i o n space w i l l space b e space m o r e space t h a n space 36 degree left parenthesis b right parenthesis 60 degree space comma t h e space a n g l e space o f f space d e v i a t i o n space w i l l space b e space m o r e space t h a n space 36 degree

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Q. (a) Write a relation for the angle of deviation (𝛿) for a ray of light passing through an equilateral prism in terms of angle of incident (i), angle of emergence (e), angle of prism (A).

(b) A ray of light incident at an angle 48o on a prism of refracting angle 60o suffers minimum deviation. Calculate the angle of minimum deviation.

(c) A light ray of yellow colour is incident on an equilateral glass prism at an angle of incidence equal to 48o and suffers minimum deviation by an angle of 36o. (i) What will be the angle of emergence? (ii) If the angle of incidence is changed to (a) 30o, (b) 60o, state whether the angle of deviation will be equal to less than or more than 36o.
Q. 1. A ray of light incident at an angle of incidence 48° on a prism of refracting angle 60° suffers minimum deviation. Calculate the angle of minimum deviation.
[Hint : δmin = 2i – A]

2. What should be the angle of incidence for a ray of light which suffers minimum deviation of 36° through an equilateral prism?
[Hint : A = 60°, i = (A + δmin) / 2]
Q. If the angle of incidence is changed to 60o. State whether the angle of deviation will be equal to, less than or more than 36o?
Q.

What should be the angle of incidence for a ray of light which suffers a minimum deviation of 36∘​ through an equilateral prism?


Q. Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism. The angle of incidence at which minimum deviation will be obtained is 60∘.
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