what do you understand by deviation produced by prism? why it is caused ?and state three factors on which the angle of deviation depends.
Answers
In a prism the ray of light suffers refraction at two faces. The prism produces a deviation at the first surface and another deviation at the second surface. Thus a prism produces a deviation in the path of light. The value of the angle of deviation (or the deviation produced by a prism) depends on the following four factors: (a) the angle of incidence (i), (b) the material of prism(i.e., on refractive index μ), (c) the angle of prism (A), (d) The colour or wavelength (λ) of light used.
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Answer: When a monochromatic ray of light passes through a prism, it bends towards the base of the prism due to refraction from the two inclined faces of the prism. Therefore, the path of the emergent ray differs from the path of incident ray. This is called the deviation produced by a prism.
Deviation produced by a prism is caused by the refraction of light by that prism.
The angle of deviation depends upon—
1) Angle of incidence.
2)The material of the prism ( or refractive index of the prism).
3) Colour (or wavelength) of light used.