1. What do you understand by deviation produced by prism? Why is it caused? State three factors on which the angle of deviation depends.
2. How does the angle of minimum deviation produced by a prism change with increase in
(i) the wavelength of incident light, and
(ii) the refracting angle of prism?
3. Write a relation for the angle of deviation (δ) for a ray of light passing through an equilateral prism in terms of the angle of incidence (i1), angle of emergence (i2) and angle of prism (A).
4. Name the colour of white light which is deviated
(i) the most, and
(ii) the least, on passing through a prism.
5. A light ray of yellow colour 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°?
Answers
Answer:
1.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
2.Shorter wavelengths travel more slowly through the prism and hence are further deviated as compared to longer wavelengths. Hence, angle of deviation decreases with increase in wavelength.
4.(i) Violet colour will deviate the most and (ii) red colour will deviate the least.
5.(i) As we know that in an equilateral glass prism the ray suffers minimum deviation. (ii) (a) As the minimum angle of deviation is 36° for yellow light, at an incident angle of 48° so for any angle of incidence other than 48° the angle of deviation will be more than 36°
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Answer:
✌️✨❤️_Good night dushman_❤️✨✌️
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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