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JEE Dispersion and Spectra PYQs with Solutions

24 previous year questions from Dispersion and Spectra (JEE Main & Advanced Physics) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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About Dispersion and Spectra PYQs

Dispersion and Spectra has 24 previous year questions in the Quantrex Academy JEE Main & Advanced Physics bank. The 24 questions in this list come from Concepts Of Physics MCQ Edition [Volume 1] (24). Each question opens on its own page with the options, the correct answer and the worked solution where available.

Dispersion and Spectra questions with solutions

1

To ensure that the deviation of the mean ray is zero, a flint glass prism and a crown glass prism are to be combined. For the mean ray, the refractive indices of the flint and

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 2

For red, yellow, and violet rays, the focal lengths of a convex lens are 100 cm , 98 cm , and 96 cm respectively. Determine the dispersive power of the material of the lens.

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 3

As the colour of light varies from red to violet, the refractive index of a certain material changes by 0.014 . A rectangular slab of height 2.00 cm constructed from this material

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 4

A specific material exhibits refractive indices of 1.56 , 1.60 , and 1.68 for red, yellow, and violet light, respectively. Determine the dispersive power of the material.

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 5

A specific material exhibits refractive indices of 1.56 , 1.60 , and 1.68 for red, yellow, and violet light, respectively. Evaluate the angular dispersion produced by a thin prism

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 6

A thin prism is constructed from a material with refractive indices of 1.61 and 1.65 for red and violet light, respectively. The material's dispersive power is 0.07 . Under

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 7

When passing through an equilateral transparent prism, the minimum deviations experienced by red, yellow, and violet beams are 38.4^ ^ ^ ∘ , 38.7^ ^ ^ ∘ , and 39.2^ ^ ^ ∘

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 8

Two prisms of identical geometrical shape are combined such that their refracting angles are oppositely directed. For violet light, the materials of the prisms have refractive

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 9

Three thin prisms are combined as shown in the figure. The refractive indices for red, yellow, and violet rays are μ_r , μ_y , and μ_v respectively for the crown glass, and μ_r'

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 10

Two identical thin crown glass prisms, each with a refracting angle A , and a thin flint glass prism of refracting angle A' , are combined together. The flint glass prism is

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 11

Two thin prisms, one of crown glass ( μ_r = 1.515 , μ_v = 1.525 ) and the other of flint glass ( μ_r = 1.612 , μ_v = 1.632 ), are positioned in contact. Each has a refracting

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 12

A thin prism of angle 6.0^ ^ ^ ∘ , ω = 0.07 and μ_y = 1.50 is combined with another thin prism having ω = 0.08 and μ_y = 1.60 . The combination produces no deviation in the mean

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 13

As the colour of light varies from red to violet, the refractive index of a material M_1 changes by 0.014 , while that of another material M_2 changes by 0.024 . Two thin prisms

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 14

As the colour of light varies from red to violet, the refractive index of a material M_1 changes by 0.014 , while that of another material M_2 changes by 0.024 . Two thin prisms

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 15

A single prism can produce a minimum deviation δ in a light beam. If three such identical prisms are combined, what is the minimum deviation that can be produced in the beam?

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 16

When a glass prism is immersed in water, its dispersive power

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 17

The angular dispersion caused by a prism

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 18

Examine the two statements given below: (A) Line spectra provide information regarding atoms. (B) Band spectra provide information regarding molecules.

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 19

A converging lens has focal lengths f_v and f_r for violet and red light, respectively.

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 20

To produce a pure spectrum, the incident light is passed through a narrow slit positioned in the focal plane of an achromatic lens because a narrow slit

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 21

A narrow beam of white light passes through a slab that has parallel faces.

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 22

Which of the following quantities associated with a lens depend on the wavelength or wavelengths of the incident light?

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 23

Considering only the magnitudes, which of the following quantities increase as the wavelength is increased?

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 24

When two prisms composed of different materials are properly combined, it is possible to

Concepts Of Physics MCQ Edition [Volume 1] Solution View →
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