The optical path difference between two light waves arriving at a point simultaneously is $260 \frac{\lambda}{4}$. The point is,

The optical path difference between two light waves arriving at a point simultaneously is $130 \frac{\lambda}{2}$. If the path difference is $650\times {10}^{-5} \mathrm{cm}$, then the wavelength of light will be,

If two waves represented by, $y_1=4\sin \omega t$ and $y_2=3\sin \left(\omega t+\frac{\pi }{3}\right)$ interfere at a point, then the amplitude of the resulting wave will be about,

Two point sources $X$ and $Y$ emit waves of same frequency and speed but $Y$ lags in phase behind $\mathrm{X}$ by $2\pi l \mathrm{rad}$. If there is a maximum in direction $D$, the distance $XO$ using $n$ as an integer is given by,

Two coherent waves of intensities $I$ and $4I$ interfere at a point. If the resultant intensity is $3{I}$, then the phase difference between the two waves at the point is,

In a movie hall, the distance between the projector and the screen is increased by $1\%$. Illumination on the screen is,

In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then, in the interference pattern,

To increase fringe width, by keeping distance between slit and screen constant, we need to ensure that,

In Young's double slit experiment, If a third slit is made in between the double slits then?