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Question
- A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
- If white light is used in the same way as in part (a) above, what change do you expect in the emergent beam?
- What conclusion do you draw about the nature of white light in part (b)?
Solution
- The beam of light pass parallel to the base.
- White light splits into its constituent colours i.e., spectrum is formed.
- White light is Polychromatic.
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Study the following figure in which a student has marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e), angle of prism (∠A) and the angle of deviation (∠D). The correctly marked angles are
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(b) ∠A, ∠i and ∠r
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