To observe diffraction,the size of an obstacle:

When the distance of separation between the slit and screen is doubled, the angular separation between fringes in single slit diffraction pattern experiment

$A$ narrow slit of width $2 \, mm$ is illuminated by monochromatic light of wavelength $500 \, nm$. The distance between the first minima on either side on a screen at a distance of $1 \, m$ is ........ $mm$.

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

$A$ 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 $,mm$)?

In Fraunhofer diffraction due to a single slit,the direction of the second secondary maximum is given by ....... ($a$ is the width of the slit).