Kabir and Neha conducted experiments on light as part of their school project. Both of them worked…
Kabir and Neha conducted experiments on light as part of their school project.
Both of them worked with the same source of monochromatic yellow light. Both obtained patterns on the screen which consisted of alternate bright and dark bands.
The images below depict their results.
(i)[1.0]
Identify the phenomenon observed by Neha.
(ii)[1.0]
The teacher asked Kabir to replace monochromatic yellow light with white light. What would be Kabir's observation now?
(iii)[1.0]
What conclusion would be drawn by Kabir and Neha about the nature of light?
Answer
Answer (i)
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Neha observed the phenomenon of diffraction of light (single-slit diffraction).
Answer (ii)
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Kabir will observe a central white fringe surrounded on either side by a few coloured fringes (with the violet fringe closest to the center and red farther out), which gradually merge into uniform illumination.
Answer (iii)
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Kabir and Neha conclude that light exhibits wave nature.
From ISC 2026 Physics Paper 1, question 15.