If the source of light used in a Young's double slit experiment is changed from red to violet: (a) the fringes will become brighter. (b) the intensity of minima will increase. (c) consecutive fringe lines will come closer. (d) the central bright fringe will become a dark fringe.

Answer: (c). β ∝ λ and λviolet < λred, so consecutive fringes come closer. The central fringe stays bright (zero path difference) and minima stay dark. So the answer is (c).

If the source of light used in a Young's double slit experiment is… | JEE Main 2021 (24 Feb, Shift 2)

Q47JEE Main 2021 · 24 FEB · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

If the source of light used in a Young's double slit experiment is changed from red to violet:

Show answer and solution

Answer: (c)

$\beta \propto \lambda$ and $\lambda_{violet} < \lambda_{red}$ , so consecutive fringes come closer.
The central fringe stays bright (zero path difference) and minima stay dark.
So the answer is (c).

Report a mistake

More questions on YDSE: Fringe Width & Fringe Positions

In Young's double slit experiment, the distance of n th dark band from the central bright…MHT CET 2021 (23 Sep, Shift 2)
In Young's double slit experiment, the 10 th maximum of wavelength ' λ₁ ' is at a…MHT CET 2021 (22 Sep, Shift 1)
In Young's double slit experiment, the ' nth ' maximum of wavelength ' λ₁ ' is at a…MHT CET 2021 (20 Sep, Shift 1)
In Young's double slit arrangement, slits are separated by a gap of 0.5 mm, and the…JEE Main 2021 (18 Mar, Shift 1)
The path difference between two interfering light waves meeting at a point on the screen…MHT CET 2021 (24 Sep, Shift 2)
Two coherent sources of wavelength ' λ ' produce steady interference pattern. The path…MHT CET 2021 (21 Sep, Shift 2)
Two coherent sources 'P' and 'Q' produce interference at point 'A' on the screen, where…MHT CET 2021 (21 Sep, Shift 2)
In Young's double slit experiment, with a source of light having wavelength 6300 Å, the…MHT CET 2021 (20 Sep, Shift 2)

YDSE: Fringe Width & Fringe Positions question from JEE Main 2021 (24 Feb, Shift 2)

More questions on YDSE: Fringe Width & Fringe Positions