Question

What happens to the width of the central diffraction pattern (in the single slit experiment) as the slit width is changed and why?

Answer 1

width of fringes are increased

Step-by-step explanation:

The width of central maxima is given by the following expression

Width = 2 x Dλ / d

1. D is distance of screen from source , d is slit width and λ is wavelength of light source.
2. Here we see , on d getting decreased , width will increase because d is in denominator .

Due to increased width , position of a fringe moves away from the centre.