Wave optics practice · Medium

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

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

An unpolarised beam of intensity $2{a^2}$ passes through a thin Polaroid. Assuming zero absorption in the Polaroid, the intensity of emergent plane polarized light is

In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness $t$ is introduced in the path of one of the interfering beams (wave-length $\lambda$ ), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is -

Which one of the following phenomena is not explained by Huygen’s construction of wavefront

In young's experiment a plate of thickness $\mathrm{t}$ having refractive index $\mu$ is placed infront of one slit. Find the minimum thickness of plate which will make the intensity at centre of the screen zero.

When unpolarised light is incident on a plane glass plate at Brewster's angle, then which of the following statements is correct?

A beam of natural light falls on a system of 5 nicol prisms, whose transmission axis are turned, each through an angle $\alpha=30^{\circ},$ with respect to the previous prism. The fraction of the intensity that passed through the system is

A polarizer is used to

According to Newton’s corpuscular theory, the speed of light is

To demonstrate the phenomenon of interference, we require two sources which emit radiation

A single slit of width a is illuminated by violet light of wavelength $400\;nm$ and the width of the diffraction pattern is measured as $y$. When half of the slit width is covered and illuminated by yellow light of wavelength $600\;nm$, the width of the diffraction pattern is

Evidence for the wave nature of light cannot be obtained from