The first diffraction minima due to a single slit diffraction is at $\mathrm{\theta }=30°$ for a light of wavelength $5000 \mathrm{\AA }$. The width of the slit is -

The phenomenon of diffraction of light was discovered by,

If we observe the single slit Fraunhofer diffraction with wavelength $\lambda$ and slit width $d$, the width of the central maxima is $2\theta$. On decreasing the slit width for the same $\lambda$,

The diffraction fringes obtained by a single slit are of

What is necessary for easy occurrence of Fresnel's diffraction?

In a diffraction pattern, width of a fringe,

The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be,

To observe the diffraction phenomenon, the minimum size of the hole is needed for which of the following waves.