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.
(i) Give any one more instance in which this type of spectrum is observed.
(ii) What happens to white light in the above case?
(iii) (A) List two conditions necessary to observe a rainbow.
OR
(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.
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.
(i) Give any one more instance in which this type of spectrum is observed.
(ii) What happens to white light in the above case?
(iii) (A) List two conditions necessary to observe a rainbow.
OR
(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.
(i) Another instance in which this type of spectrum is observed is in a rainbow.
(ii) In the above case, white light is dispersed into its component colors by the glass prism.
(iii) (A) Two conditions necessary to observe a rainbow are:
- The sun should be shining brightly.
- There should be water droplets in the air.
OR
(iii) (B) The ray diagram to show the formation of a rainbow is shown below:
(a) Dispersion of light occurs at point A.
(b) Light gets reflected internally at point B.
(c) Final refraction occurs at point C.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2025?
This question carries 4 marks in the CBSE Class 10 Science 2025 examination.
Which chapter does this question come from in Science?
This question is from the chapter "The Human Eye and the Colourful World" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Refraction of Light" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2025 paper?
This question appears in Section E in the CBSE Class 10 Science 2025 paper.