The penetration of light into the region of geometrical shadow is called:

"The person standing behind the open door inside the room can hear the voice of the person standing on the other side of the door but they cannot see each other". Give an experiment based on the diffraction for this statement.

In Fraunhofer diffraction due to a single slit,find the path difference for the $n^{th}$ order minimum.

Yellow light is used in a single slit diffraction experiment with a slit width of $0.6 \, mm$. If the yellow light is replaced by $X$-rays,then the pattern will reveal:

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

If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the central maximum is $30^{\circ}$ in a single slit diffraction pattern recorded using $628 \ nm$ light,then the width of the slit is . . . . . . $\mu m$.