Question

In a diffraction pattern due to a single slit, how will the angular width of the central maximum change, if orange light is used in place of green light?

Justify your answer.

Answer 1

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

Angular width of central maxima ∝ wavelength of light used. Orange light has a higher wavelength than that green light. So, the Angular width of the central maxima will be more when orange light is used instead of green light.