Question

In diffraction pattern:

• A. The fringe widths are equal
• B. The fringe widths are not equal
• C. The fringes can not be produced
• D. The fringe width may or may not be equal

Answer 1

Answer: (B)

The fringe widths are not equal

In diffraction pattern minima are obtained at angles ${\theta }_n$ given by:
$dsin{\theta }_n=n\lambda$
Because of sinusoidal dependence the fringe widths are not equal.