In a Young's double-slit experiment,both the wavelength and the slit separation are increased by 25%.What happens to the distance between two adjacent bright fringes?
A) It decreases by 50%.
B) It increases by 50%.
C) The distance increases by 25% or more.
D) The distance stays the same.

Question

Quizplus · Accepted Answer

The distance between adjacent bright fringes in a Young's double-slit experiment is given by dλ/D where d is the slit separation, λ is the wavelength, and D is the distance between the slits and the screen. If both λ and d are increased by 25%, then the distance between adjacent bright fringes will remain the same because the ratio of dλ/D is unchanged.

In a Young's Double-Slit Experiment,both the Wavelength and the Slit