Physics
Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation. How is the angle of emergence related to the angle of incidence in this position.
Refraction Plane Surfaces
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Answer
Below diagram shows the refraction of a monochromatic light ray through a prism when it suffers minimum deviation:
In an equilateral prism, when the prism is in minimum deviation, the angle of incidence i1 is equal to the angle of emergence i2.
Hence,
Angle of emergence (i2) = Angle of incidence (i1).
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Related Questions
An object is viewed through a glass prism with its vertex pointing upwards. Draw a ray diagram to show the formation of its image as seen by the observer on the other side of the object.
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?
What do you understand by the deviation produced by a prism? Why is it caused? State three factors on which the angle of deviation depends.
(a) How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.
(b) Using the curve in part (a) above, how would you infer that for a given prism, the angle of minimum deviation 𝛿min is unique for light of a given wavelength.