CBSE 2025 · Region 4 · Set 1 · Q15 · 1 mark
Assertion (A) : In double slit experiment if one slit is closed, diffraction pattern due to the other slit will appear on the screen. Reason $\displaystyle (R)$: For interference, at least two waves are required.
Official answer
From CBSE’s own marking scheme for this paper.
(C)
Assertion (A) is true, but Reason (R) is false.
Wave OpticsDiffractionUnderstandassertion_reasonmedium
More from Wave Optics
- Assertion: In interference and diffraction of light, light energy reduces in one region producing a dark…2024 · asked 3×
- Assertion: In a Young's double-slit experiment, interference pattern is not observed when two coherent…2024 · asked 3×
- What are coherent sources? Why they are necessary for observing stable interference pattern? Draw a graph…2026 · asked 3×
- In a Young's double-slit experiment, the fringe width is found to be β. If the entire apparatus is immersed…2023 · asked 3×
- Assertion: In Young's double slit experiment all fringes are of equal width. Reason (R): The fringe width…2023 · asked 3×
- (i) A plane light wave propagating from a rarer into a denser medium, is incident at an angle i on the…2024 · asked 3×
- Assertion: Light added to light can produce darkness. Reason (R): When two coherent light waves interfere,…2026 · asked 3×
- In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its…2023 · asked 3×
CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.