Wave Optics

A linear aperture whose width is $0.02 cm$ is placed immediately in front of a lens of focal length $60 cm.$ The aperture is illuminated normally by a parallel beam of wavelength $5\times\,10^{-5}\mathrm{}cm$. The…

A beam of light of $\lambda\,=600nm$ from a distant source falls on a single slit $1mm$ wide and the resulting diffraction pattern is observed on a screen $2m$ away. The distance between first dark fringes on either…

Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, $\frac{I_{max}}{I_{min}}$ is:

In the Young's double slit experiment the intensity of light at a point on the screen where the path difference is $\lambda\,$ is $K,$ ($\lambda\,$ being the wave length of light used). The intensity at a point where…

In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

The ratio of the power of a light source $S_1$ to that the light source $S_2$ is $2 . S_1$ is emitting $2 \times 10^{15}$ photons per second at 600 nm . If the wavelength of the source $S_2$ is 300 nm , then the number…

Two satellites revolve around a planet in coplanar circular orbits in anticlockwise direction. Their period of revolutions are $1$hour and $8$ hours respectively. The radius of the orbit of nearer satellite is…

A point source is kept at a distance of \(1000 \mathrm{~m}\) has an illumination \(I\). To change the illumination to \(16 I\) the new distance should become

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium…

In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength $\lambda$ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular…

The interference pattern is obtained with two coherent light sources of intensity ratio, \$n$. In the interference pattern, the ratio, \$\frac{I_{max}-I_{min}}{I_{max}+I_{min}}$ will be

The intensity at the maximum in a Young's double slit experiment is I0. Distance between two slits is d=5$\lambda$, where $\lambda$ is the wavelength of light used in the experiment. What will be the intensity in front…