Dispersion: which colour bends most and the order of the spectrum

This type of question, asked 4 times: 2023, 2024, 2025, 2026. All 9 questions below, oldest first.

Try each one first, then open its answer.

Question 1
2023
13 $In the following diagram showing dispersion of white light by a glass prism, the colours ‘P’ and ‘Q’ respectively are -$
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Question 2
2024
13 $The colour of light for which the refractive index of glass is minimum, is :$
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Question 3
2025
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
20 $Assertion (A) : White light is dispersed by a glass prism into seven colours. Reason (R) : The red light bends the least while the violet the most when a beam of white light passes through a glass prism.$
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Question 4
2025
13 $The white light entering a glass prism, gets split into its constituent colours. It is observed that :$
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Question 5 (case study, 4 parts)
2025
A person allowed a narrow beam of white light from the sun to enter a dark room through a small aperture and placed a glass prism in its path in such a manner that the beam falls on the face AB of the prism as shown in the figure. A screen S is placed on the other side of the prism, facing AC. On turning the prism slowly, a beautiful band of colours is obtained on the screen. It is the spectrum of sunlight.
39 (a) $Name the phenomenon due to which a prism splits the incident white light into a band of colours.$
39 (b) $State the reason of getting a band of seven colours in the above case.$
39 (c) (i) $Explain with the help of a labelled ray diagram, an experimental arrangement to show the recombination of the spectrum of white light.$
39 (c) (ii) $Draw a labelled ray diagram to show the formation of a rainbow.$
Question 6 (case study, 4 parts)
2025
The students in a class took a thick sheet of cardboard and made a small hole in its centre. Sunlight was allowed to fall on this small hole and they obtained a narrow beam of white light. A glass prism was taken and this white light was allowed to fall on one of its faces. The prism was turned slowly until the light that comes out of the opposite face of the prism appeared on the nearby screen. They studied this beautiful band of light and concluded that it is a spectrum of white light.
39 (i) $Give any one more instance in which this type of spectrum is observed.$
39 (ii) $What happens to white light in the above case?$
39 (iii) (A) $List two conditions necessary to observe a rainbow.$
39 (iii) (B) $Draw a ray diagram to show the formation of a rainbow. Mark on it, points (a), (b) and (c) as given below : (a) Where dispersion of light occurs. (b) Where light gets reflected internally. (c) Where final refraction occurs.$
Question 7
2026
31 $Observe the given ray diagram showing refraction through a prism and choose the correct option for colour of rays 1 and 2 : Colour of ray 1, Colour of ray 2$
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Question 8
2026
Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the options given below.
32 $Assertion (A) : When rays of white light pass through a prism, on emerging they give spectrum of seven colours. Reason (R) : It is due to the scattering of light that red light bends minimum and violet light bends the maximum.$
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Question 9
2026
31 $A thin beam of white light falls on a face of a glass prism and a spectrum is obtained on a screen. Which of the following options is the correct sequence of colours from top to bottom on the screen ?$
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Dispersion: which colour bends most and the order of the spectrum

Question 1

Question 2

Question 3

Question 4

Question 5 (case study, 4 parts)

Question 6 (case study, 4 parts)

Question 7

Question 8

Question 9