Wave Optics

In interference and diffraction, the light energy is redistributed. If it reduces in one region, producing a dark fringe, it increases in another region, producing a bright fringe.
A. As there is no gain or loss of energy, these phenomena a...

In Young's double slit experiment, using monochromatic light of wavelength $\lambda$, the intensity of light at a point on the screen where the path difference is $\lambda$, is $K$ units. The intensity of light at a point where the path dif...

The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from the polarization axis of one of the polaroids, is ( $I 0_0$ is the intensity of polarised light after passing through the ...

An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then

A beam of unpolarized light of intensity I0 is passed through a polaroid A, then through another polaroid B,
oriented at \(60^\circ\) and finally through another polaroid C, oriented at 45\(^\circ\) relative to B as shown. The intensity of
...

Interference pattern can be observed due to superposition of the following waves:
A. \(y=a \sin \omega t\)
B. \(y=a \sin 2 \omega t\)
C. \(y=a \sin (\omega t-\phi)\)
D. \(y=a \sin 3 \omega t\)
Choose the correct answer from the options give...

Two slits in Young's double slit experiment are \(1.5 \mathrm{~mm}\) apart and the screen is placed at a distance of \(1 \mathrm{~m}\) from the slits. If the wavelength of light used is \(600 \times 10^{-9} \mathrm{~m}\) then the fringe sep...

An unpolarised light beam strikes a glass surface at Brewster's angle. Then

If the monochromatic source in Young's double slit experiment is replaced by white light, then

Which set of colours will come out in air for a situation shown in figure?

For Young's double slit experiment, two statements are given below :
Statement I : If screen is moved away from the plane of slits, angular separation of the fringes remains constant.
Statement II : If the monochromatic source is replaced b...

After passing through a polariser a linearly polarised light of intensity I is incident on an analyser making an angle of 30\(^\circ\) with that of the polariser. The intensity of light emitted from the analyser will be

If the screen is moved away from the plane of the slits in a Young's double slit experiment, then the :

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would o...

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 :

Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2o. What will be the angular width of the first minima, (\(\mu\)water = 4/3) ...

Unpolarised light is incident from air on a
plane surface of a material of refractive index
\(\mu\). At a particular angle of incidence i, it is
found that the reflected and refracted rays
are perpendicular to each other. Which of
the foll...

In Young’s double slit experiment the
separation d between the slits is 2 mm, the
wavelength \(\lambda\) of the light used is 5896 \(\mathop A\limits^0\) and
distance D between the screen and slits is
100 cm. It is found that the angular ...

Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light \(I\)0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45o with that of P1. The intensit...

The ratio of resolving powers of an optical microscope for two wavelength \(\lambda\)1 = 4000 \(\mathop A\limits^ \circ\) and \({\lambda _2}\) = 6000 \(\mathop A\limits^ \circ\) is

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 is nearly

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aparture is illuminated normally by a parallel beam of wavelength 5 \(\times\) 10\(-\)5 cm. The distance of the first dark band o...

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

In a diffraction pattern due to a single slit of width \(a\), the first minimum is observed at an angle 30o when light of wavelength 5000 \(\mathop A\limits^ \circ\) is incident on the slit. The first secondary maximum is observed at an ...

The intensity at the maximum in a Young's double slit experiment is \(I\)0. Distance between two slits is d = 5\(\lambda\), where \(\lambda\) is the wavelength of light used in the expreriment. What will be the intensity in front of one o...

In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central ...

For a parallel beam of monochromatic light of wavelength '\(\lambda\)' , diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the wifth...

At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is

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, \({{{I_{max}}} \over {{I_{min}}}}\) is

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

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

A parallel beam of light of wavelength \(\lambda\) is incident normally on a narrow slit. A diffraction pattern formed on a screen placed perpenficular to the direction of the incident beam. At the second minimum of the diffraction pattern...

In Young's double slit experiment the distance between the slits and the screen is doubled. The separation between the slits is reduced to half. As a result the fringe width

The reddish appearance of the sun at sunrise and sunset is due to

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths \({\lambda _1}\) = 12000 \(\mathop A\limits^ \circ\) and \({\lambda _2}\) = 10000 \(\mathop A\limits^ \circ\). At what minimum...

The frequency of a light wave in a material is 2 \(\times\) 1014 Hz and wavelength is 5000 \(\mathop A\limits^ \circ\). The refractive index of material will be

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 \(\mathop A\limits^ \circ\) is of the order of

A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometer from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light i...

A ray of light travelling in air have wavelength \(\lambda\), frequency n, velocity v and intensity \(I\). If this ray enters into water then these parameters are \(\lambda\)', n', v' and \(I\)' respectively. Which relation is correct fro...