If $n$ represents the order of a half-period zone,the area of this zone is approximately proportional to $n^m$,where $m$ is equal to:

If a classroom door is open just a small amount, we can hear sounds coming from the room but we can't see what is going on inside the room because

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:

$A$ screen is placed at a distance $50\,cm$ from a single slit,which is illuminated with light of wavelength $690\,nm$. If the distance between the first and third minima is $3.00\,mm$,what is the width of the slit (in $,mm$)?

On which factor does the number of interference fringes in a given width of a diffraction peak depend?

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