Question

In a diffraction pattern due to a single slit, how will the angular width of the central maximum change, if the screen is moved closer to the slit?

Justify your answer.

Answer 1

The angular width of central maxima of a single slit diffraction pattern is 2θ = `(2λ)/"a"`

Angular width of the central maxima is independent of the distance between the slit and the screen. So, if the screen is moved closer to the slit there will be no change in the angular width of the central maxima.