The luminous border that surrounds the profile of a mountain just before the sun rises behind it is an example of:

In the diffraction pattern of a single slit,the width of the secondary maxima compared to the central maximum is:

Light of wavelength $6000 \ \mathring{A}$ is incident on a slit. The width of the slit is $0.30 \ mm$. A screen is placed at a distance of $2 \ m$ from the slit. Find the width of the central maximum in $mm$.

Light of wavelength $\lambda$ is incident on a single slit of width $a$ and the distance between the slit and the screen is $D$. In the diffraction pattern, if the slit width is equal to the width of the central maximum, then $D$ is equal to:

In the experiment of diffraction at a single slit,if the slit width is decreased,the width of the central maximum

The angular spread of the central maximum in a diffraction pattern does not depend on . . . . . . .