Wave Optics

In an experiment, two polariods are arranged such that the intensity of the polarised light emerged from the second polaroid is $37.5 \%$ of the intensity of the unpolarised light incident on the first polaroid. Then the angle between the a...

According to Rayleigh, when sunlight travels through atmosphere, the amount of scattering is proportional to $n$th power of wavelength of light. Then, the value of 'r is

In Young' double slit experiment, if the distance between the slits is 2 mm and the distance of the screen from the slits is 100 cm , the fringe width is 0.36 mm . If the distance between the slit is decreased by 0.5 mm and the distance of ...

A narrow slit of width 2 mm is illuminated with a monochromatic light of wavelength 500 nm . If the distance between the slit and the screen is 1 m , then first minima are separated by a distance of

In Young's double slit experiment, the distance between the slits is 0.2 cm , the distance between the screen and the slits is 1 m . If the wavelength of light used in the experiment is $5000 \mathop {\rm{A}}\limits^{\rm{o}}$, then the dist...

In Young's double slit experiment, if the distance between the slits is increased to 3 times initial distance, then the ratio of initial and final fringe widths is

An unpolarised beam of light incidents on a group of three polarising sheets arranged such that the angle between the axes of any two adjascent sheets is $30^{\circ}$. The ratio of the intensities of polarised light emerging from the second...

In Young's double slit experiment, the wavelength of monochromatic light is increased by $20 \%$ and the distance between the two slits is decreased by $25 \%$. If the initial fringe width is 0.3 mm , then the final fringe width is

In Young's double slit experiment, the wavelengths of red and blue lights used are $7.5 \times 10^{-5} \mathrm{~cm}$ and $5 \times 10^{-5} \mathrm{~cm}$ respectively. If $n$th bright fringe of red color coincides with $(n+1)$ th bright frin...

Two light waves of intensities $I$ and $2 I$ superimpose on each other. If the path difference between the light waves reaching a point is $12.5 \%$ of the wavelength of the light, then the resultant intensity at the point, is (Both the lig...

If a slit of width $x$ was illuminated by red light having wavelength $6500\mathop {\rm{A}}\limits^{\rm{^\circ }}$, the first minima was obtained at $\theta=30^{\circ}$. Then, the value of $x$ is

The angle between the axes of a polariser and an analyser is $45^{\circ}$. If the intensity of the unpolarised light incident on the polariser is $I$, then the intensity of light emerged from the analyser is

In case of diffraction, if $a$ is a slit width and $\lambda$ is the wavelength of the incident light, then the required condition for diffraction to take place is

In Young's double slit experiment two slits are placed 2 mm from each other. Interference pattern is observed on a screen placed 2 m from the plane of the slits. Then the fringe width for a light of wavelength 400 nm is

If a microscope is placed in air, the minimum separation of two objects seen as distinct is $6 \mu \mathrm{~m}$. If the same is placed in a medium of refractive index 1.5, then the minimum separation of the two objects to see as distinct is

In Young's double slit experiment, the intensity at a point where the path difference is $\frac{\lambda}{6}$ ( $\lambda$ being the wavelength of the light used) is $I$. If $I_0$ denotes the maximum intensity, $\frac{I}{I_0}$ is equal to

In Young's double slit experiment with monochromatic light of wavelength 6000 A . The fringe width is 3 mm . If the distance between the screen and slits is increased by $50 \%$ and the distance between the slits is decreased by $10 \%$, th...

\(\text { Blue colour of the sky is due to }\)

The property of light which cannot be explained by Huygen's construction of wavefront is

In a Young's double slit experiment, if the wavelength of light is increased by 50\% and the distance between the slits is doubled, then the percentage change in fringe width is

In Young's double slit experiment the slits are 3 mm apart and are illuminated by light of two wavelengths \(3750 \mathop A\limits^o\) and \(7500 \mathop A\limits^o\). The screen is placed at 4 m from the slits. The minimum distance from th...

Young's double slit experiment is conducted with monochromatic light of wavelength 5000\(\mathop A\limits^o\), with slit separation of 3 mm and observer at 20 cm away from the slits. If a 1 mm transparent plate is placed infront of one of ...

When monochromatic light of wavelength 600 nm is used in Young's double slit experiment, the fifth order bright fringe is formed at 6 mm from the central bright fringe on the screen. If the experiment is conducted with light of wavelength 4...

The position of the direct image obtained at
O, when a monochromatic beam of light is
passed through a plane transmission grating
at normal incidence is shown in figure.
The diffracted images A, B, and C correspond
to the first, second and ...

The wavefront is a surface in which

In a diffraction pattern due to a single slit of width \(a\), the first minimum is observed at an angle \(30 \Upsilon\) when light of wavelength \(500 \mathrm{~nm}\) is incident on the slit. The first secondary maximum is observed at an ang...

In Young’s double slit experiment, the
separation between the slits is halved and the
distance between the screen is doubled. The
fringe width is