Wave optics practice · Mixed difficulty

If the source of light used in a Young’s double slit experiment is changed from red to violet, then

The radius r of half period zone is proportional to

When an unpolarized light of intensity ${I_0}$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

If microwaves, X rays, infrared, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum are denoted by M, X, I, G, U, R and V then which of the following is the arrangement in ascending order of wavelength?

In a double-slit experiment, green light $(5303\mathop \mathrm{A}\limits^\mathrm{o} )\mathrm{ }$ falls on a double slit having a separation of $19.44\mu m$ and a width of $4.05\mu m$. The number of bright fringes between the first and the second diffraction minima is

Given below two statements: One is labelled as Assertion (A) and other is labelled as Reason (R).
Assertion (A): Non-polar materials do not have any permanent dipole moment.
Reason (R): When a non-polar material is placed in an electric field, the centre of the positive charge distribution of it’s individual atom or molecule coincides with the centre of the negative charge distribution.
In the light of above statements, choose the most appropriate answer from the options given below.

Which of the following cannot be explained on the basis of wave nature of light? I. Polarization II. Optical activity III. Photoelectric effect IV. Compton effect

The dual nature of light is exhibited by

In YDSE the centre of the screen can be identified:

Statement A: If a person wants to observe sharp and clear fringes of good contrast then interference experiment is preferable compared to diffraction.

Statement B: In diffraction intensity after the central maxima decreases rapidly, so fringe pattern become blurred.

A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light

Assertion: When an unpolarised light is incident on a glass plate at Brewster angle, the reflected ray and refracted ray are mutually perpendicular.

Reason: The refractive index of glass is equal to tangent of the angle of polarisation.

Young’s experiment is performed in air and then performed in water, the fringe width

Four independent light waves are expressed as $\mathrm{y}_1=\mathrm{a}_1 \sin \omega \mathrm{t}, \mathrm{y}_2=\mathrm{a}_2 \sin \omega \mathrm{t}, \mathrm{y}_3=\mathrm{a}_3 \cos \omega \mathrm{t}$ and $\mathrm{y}_4=\mathrm{a}_4 \sin (\omega \mathrm{t}+\pi / 3)$. The interference is possible between

Two slits are separated by a distance of $0.5\;mm$ and illuminated with light of $\lambda = 6000\mathop \mathrm{A}\limits^ \circ$. If the screen is placed $2.5\;m$ from the slits. The distance of the third bright fringe from the centre will be

Two nicolprism are first crossed and then one of them is rotated through $60^\circ$. The percentage of incident light transmitted is

A beam of polarised light makes an angle of $60^{\circ}$ with the axis of the polaroid sheet. How much is the intensity of light transmitted through the sheet?

In Young’s double slit experiment a minima is observed when path difference between the interfering beam is

Assertion: The clouds in sky generally appear to be whitish.

Reason: Diffraction due to clouds is efficient in equal measure at all wavelengths.

Two identical light sources ${{S_1}\;and\;{S_2}}$ emit light of same wavelength $\lambda$. These light rays will exhibit interference if

Consider the following statements about electromagnetic waves and choose the correct ones
S1 : Electromagnetic waves having wavelengths 1000 times smaller than light waves are called $X$ -rays
S2 : Ultraviolet waves are used in the treatment of swollen joints
S3 : Alpha and gamma rays are not electromagnetic waves
S4 : de Broglie waves are not electromagnetic in nature
S5 : Electromagnetic waves exhibit polarization while sound waves do not

If the intensities of the two interfering beams in Young’s double alit experiment be ${I_1}$ and ${I_2}$, then the contrast between the maximum and minimum intensity is good when

In case of linearly polarized light, the magnitude of the electric field vector

The coherent formula for fringe visibility is

Assertion: Light form two cohetent sources is reaching the screen. If the path difference at a point on the screen for yellwo light is $3 \lambda / 2$, then the fringe at the point will be coloured.

Reason: Two cohernent sources always have constant phase relationship.

In a two slits experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved by $5 \times {10^{ - 2}}\;m$ towards the slits, the change in fringe width is $3 \times {10^{ - 5}}\;m$. If separation between the slits is ${10^{ - 3}}\;m$, the wavelength of light used is

The idea of secondary wavelets for the propagation of a wave was first given by

Solar spectrum is an example for

If white light is used in a biprism experiment then

An observer looks at a distance tree of height 10 m with a telescope of magnifying power of 20. To the observer the tree appears