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Question
Name three factors on which the deviation produced by a prism depends and state how does it depend on the factors stated by you.
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Solution
The following four factors affect the deviation the prism produces:
- The angle of incidence: As the angle of incidence increases, first the angle of deviation decreases and reaches a minimum value for a certain angle of incidence. By further increasing the angle of incidence, the angle of deviation is found to increase.
- The material of the prism (i.e., refractive index): for a given angle of incidence, the prism with a higher refractive index produces a greater deviation than the prism with a lower refractive index.
- Angle of prism: The angle of deviation increases with the increase in the angle of the prism.
- The colour or wavelength of light used increases the angle of deviation with a decrease in the wavelength of light.
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