Question

The fringe width in interference of light due to two coherent sources is:

• A. proportional to wavelength
• B. inversely proportional to wavelength
• C. proportional to square of wavelength
• D. inversely proportional to square of wavelength

Hint:

Fringe width increases with wavelength in interference patterns.

Answer 1

The Correct Option is A

The fringe width \(\beta\) in interference is given by: \[ \beta = \frac{\lambda D}{d} \] where \(\lambda\) is the wavelength, \(D\) is the distance to the screen, and \(d\) is the distance between the sources. Hence, fringe width is directly proportional to the wavelength.