Question

In an interference experiment, the spacing between successive maxima or minima is :

• A. $\frac{\lambda d}{D}$
• B. $\frac{\lambda D}{d}$
• C. $\frac{dD}{\lambda}$
• D. $\frac{\lambda d}{4D}$

Answer 1

Answer: (B)

(2) $\frac{\lambda D}{d}$

Answer 2

The spacing between successive maxima or minima in an interference pattern, also known as fringe width ($\beta$), is given by the formula $\beta = \frac{\lambda D}{d}$. Here, $\lambda$ is the wavelength of light, $D$ is the distance between the slits and the screen, and $d$ is the distance between the two coherent slits. This formula is derived from the path difference condition for constructive and destructive interference.