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The Angular Dispersion Produced by a Prism - Physics

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प्रश्न

The angular dispersion produced by a prism ___________ .

पर्याय

  • increases if the average refractive index increases

  • increases if the average refractive index decreases

  • remains constant whether the average refractive index increases or decreases

  • has no relation with average refractive index

MCQ
रिकाम्या जागा भरा

उत्तर

increases if the average refractive index increases

 

If μ is the average refractive index and is the angle of prism, then the angular dispersion produced by the prism is given by \[\delta = (\mu - 1)A\]

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पाठ 20: Dispersion and Spectra - MCQ [पृष्ठ ४४१]

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एचसी वर्मा Concepts of Physics Vol. 1 [English] Class 11 and 12
पाठ 20 Dispersion and Spectra
MCQ | Q 1 | पृष्ठ ४४१

संबंधित प्रश्‍न

Plot a graph to show the variation of the angle of deviation as a function of the angle of incidence for light passing through a prism. Derive an expression for the refractive index of the prism in terms of angle of minimum deviation and angle of the prism.


What is a dispersion of light


Figure shows a ray of light passing through a prism. If the refracted ray QR is parallel to the base BC, show that (i) r1 = r2 = A/2 and (ii) angle of minimum deviation, Dm = 2i − A.


 Out of blue and red light which is deviated more by a prism? Give reason.


Can the dispersive power \[\omega = \frac{\mu_u - \mu_r}{\mu - 1}\] be negative? What is the sign of ω if a hollow prism is immersed into water?


If three identical prisms are combined, is it possible to pass a beam that emerges undeviated? Undispersed?


If a glass prism is dipped in water, its dispersive power ___________ .


By properly combining two prisms made of different materials, it is possible to

(a) have dispersion without average deviation

(b) have deviation without dispersion

(c) have both dispersion and average deviation

(d) have neither dispersion nor average deviation


A certain material has refractive indices 1.56, 1.60 and 1.68  rfor red, yellow and violet lightespectively. (a) Calculate the dispersive power. (b) Find the angular dispersion produced by a thin prism of angle 6° made of this material.


A thin prism is made of a material having refractive indices 1.61 and 1.65 for red and violet light. The dispersive power of the material is 0.07. It is found that a beam of yellow light passing through the prism suffers a minimum deviation of 4.0° in favourable conditions. Calculate the angle of the prism.


Two prisms of identical geometrical shape are combined with their refracting angles oppositely directed. The materials of the prisms have refractive indices 1.52 and 1.62 for violet light. A violet ray is deviated by 1.0° when passes symmetrically through this combination. What is the angle of the prisms?


Three thin prisms are combined as shown in figure. The refractive indices of the crown glass for red, yellow and violet rays are μr, μy and μv respectively and those for the flint glass are μ'r, μ'y and μ'v respectively. Find the ratio A'/A for which (a) there is no net angular dispersion, and (b) there is no net deviation in the yellow ray.


A thin prism of crown glass (μr = 1.515, μv = 1.525) and a thin prism of flint glass (μr = 1.612, μv = 1.632) are placed in contact with each other. Their refracting angles are 5.0° each and are similarly directed. Calculate the angular dispersion produced by the combination.


A thin prism of angle 6.0°, ω = 0.07 and μy = 1.50 is combined with another thin prism having ω = 0.08 and μy = 1.60. The combination produces no deviation in the mean ray. (a) Find the angle of the second prism. (b) Find the net angular dispersion produced by the combination when a beam of white light passes through it. (c) If the prisms are similarly directed, what will be the deviation in the mean ray? (d) Find the angular dispersion in the situation described in (c).


The deviation produced for violet, yellow and red lights for crown glass are 3.75°, 3.25° and 2.86° respectively. Calculate the dispersive power of the crown glass.


In a regular prism, what is the relation between angle of incidence and angle of emergence when it is in the minimum deviation position?


For any prism, obtain a relation between the angle of the prism (A), the angle of minimum deviation (δm) and the refractive index of its material (μ or n).


What is meant by a thin prism?


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