In a single slit diffraction experiment,when the distance of separation between the slit and the screen is doubled,the angular separation between the fringes

The phenomenon of diffraction of light was discovered by

Angular width $(\beta)$ of the central maximum of a diffraction pattern on a single slit does not depend upon

In a single slit diffraction experiment,for a wavelength of light $\lambda$,the half-angular width of the central maxima is $\theta$. For a wavelength of light $p\lambda$,the half-angular width of the central maxima is $q\theta$. What is the ratio of the half-angular widths of the first secondary maxima in the first case to the second case?

When light is incident on a diffraction grating,the zero-order principal maximum will be:

In a Fraunhofer's diffraction obtained by a single slit aperture,the value of path difference for $n^{th}$ order of minima is