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

The condition for obtaining secondary maxima in the diffraction pattern due to a single slit is:

Why does a $DVD$ store almost $30$ times more information than a $CD$?

$A$ light wave is incident normally on a slit of width $24 \times 10^{-5} \, cm$. The angular position of the second dark fringe from the central maximum is $30^\circ$. What is the wavelength of light in $\mathring{A}$?

$A$ beam of light of $\lambda = 600 \, nm$ from a distant source falls on a single slit $1 \, mm$ wide and the resulting diffraction pattern is observed on a screen $2 \, m$ away. The distance between the first dark fringes on either side of the central bright fringe is:

$A$ diffraction pattern is obtained using a beam of red light. If the red light is replaced by blue light,then: