In Young’s double-slit experiment, lights of green, yellow, and orange colors are successively used. Write the fringe widths for the three colors in increasing order.
A. βG < βY < βO
B. βO < βY < βG
C. βO < βG < βY
D. βY < βG < βO
The question was posed to me during a job interview.
This intriguing question comes from Wave Optics topic in chapter Wave Optics of Physics – Class 12
The correct option is B. βO < βY < βG
To explain: Fringe width is expressed as:
β = \(\frac {D\lambda }{d}\).
Since the wavelength are related as shown ➔ λG < λY < λO, we can say that ➔ βG < βY < βO.