Monochromatic green light of wavelength $5 \times 10^{-7} \, m$ illuminates a pair of slits $1 \, mm$ apart. The separation of bright lines (fringe width) on the interference pattern formed on a screen $2 \, m$ away is ...... $mm$.

In Young's double-slit experiment,a monochromatic light source is used to illuminate slits $S_1$ and $S_2$. An interference pattern is obtained on the screen with a fringe width of $w$. If a mica sheet of thickness $t$ and refractive index $\mu$ is placed in front of one of the slits,the new fringe width $w'$ becomes:

$A$ double slit experiment is immersed in water of refractive index $1.33$. The slit separation is $1 \,mm$, and the distance between the slit and the screen is $1.33 \,m$. The slits are illuminated by light of wavelength $6300 \,Å$. The fringe width is:

In Young's double-slit experiment,if the amplitudes of the interfering waves are not equal,then . . . . .

In a Young's double slit experiment, a small detector measures an intensity of illumination of $I$ units at the centre of the fringe pattern. If one of the two (identical) slits is now covered, the measured intensity will be

In Young's double slit experiment,if monochromatic light is replaced by white light: