Wave optics practice · Medium

Statement I : To observe diffraction of light, the size of obstacle/aperture should be of the order of $10^{-7} \mathrm{~m}$.
Statement II : $10^{-7} \mathrm{~m}$ is the order of wavelength of the visible light.

In the interference pattern, energy is

In the intensity of Interference waves in an interference pattern is same as ${I_O}$. The resultant intensity at the point of observation will be

Appearance of colours on thin soap film is due to

Which one of the following property of light does not support wave theory of light?

Light waves travel in vacuum along the $y - \mathrm{axis}$. Which of the following may represent the wavefront?

In Young’s double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case

Doppler’s effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depends only on the relative velocity of source and observer. The reason of this is

High speed moving particles are studied under

Monochromatic light of wavelength $600 \mathrm{~nm}$ is incident from air on a glass surface (refractive index of glass is $1.5$). The speed of the refracted light will be

The conditions for producing sustained interference are

I. Phase difference between interfering waves remains constant with time.

II. Interfering waves have nearly same amplitude levels.

III. Interfering waves are of same frequency.

IV. Interfering waves are moving of opposite directions.

When light ray moving from air to medium is incident at polarising angle then
(a) Reflected light is completely polarised
(b) Refracted light is partial polarised
(c) Both reflected and refracted light are perpendicular to each other.
(d) Brewster's Law $\mu=\tan \mathrm{i}_{\mathrm{p}}$ is obeyed
Choose the most correct option.

Electromagnetic waves are transverse in nature is evident by

In the Young’s double slit experiment, a mica slip of thickness t and refractive index $\mu$ is introduced in the ray from first source ${S_1}$. By how much distance fringes pattern will be displaced.

An astronomical telescope has an angular magnification of magnitude 5 for distant objects. The separation between the objective and eye-piece is $36 \mathrm{~cm}$ and the final image is formed at infinity:
(a) the focal length of objective is $30 \mathrm{~cm}$
(b) the focal length of objective is $25 \mathrm{~cm}$
(c) the focal length of eye piece is $6 \mathrm{~cm}$
(d) the focal length of eye piece is $12 \mathrm{~cm}$

Conditions of diffraction is

Two sources of waves are called coherent if

Which statement is correct for a zone plate and a lens

Maximum intensity in YDSE is ${I}_0$. The intensity at a point on the sereen where the path difference between the two interfering waves is $\frac{\lambda}{3}$ will be;

The phenomenon which does not take place in sound waves is

If prism angle $\alpha=1^{\circ}, \mu=1.54$, distance between screen and prism (b) $=0.7 \mathrm{~m}$, distance between prism and source $a=0.3 \mathrm{~m}, \lambda=180 \pi \mathrm{nm}$ then in Fresnal biprism find the value of $\beta$ (fringe width)

In the context of Doppler effect in light, the term ‘red shift’ signifies

The phase difference between two wave trains giving rise to a dark fringe in Young's double slit interference experiment is ($\mathrm{n}$ integer):

Which of the following is conserved when light waves interfere

Two coherent sources each emitting light of Intensity $I_0$ interfere in a medium at a point where phase difference between them is $\frac{2 \pi}{3}$. The resultant intensity at the point is

Select the right option in the following

If $L$ is the coherence length and $c$ the velocity of light, the coherent time is

Which if the following phenomena is not common to sound and light waves?

If two waves represented by ${y_1} = 4\sin \omega t\;and\;{y_2} = 3\sin \left( {\omega t + \frac{\pi }{3}} \right)$ interfere at a point, the amplitude of the resulting wave will be about

In Young’s double slit experiment, if the widths of the slits are in the ratio $\mathrm{4 }:\mathrm{ 9}$, the ratio of the intensity at maxima to the intensity at minima will be