AIIMS Physics Wave Optics Class 12 Questions

A light of wavelength 500 nₘ is incident on a Young's double slit. The distance between slits and screen is D = 1.8 m and distance between slits is d = 0.4 mm. If screen moves with a speed 4 m/s, with what speed first maxima will move?

In YDSE a = 2 mm, D = 2 m, λ = 500 nₘ. Find the distance of point on screen from central maxima where intensity becomes 50% of central maxima

Distance of 5^{th} dark fringe from centre is 4 mm. If D = 2 m, λ = 600 nₘ, then distance between slits is :

Distance of 5th dark fringe from centre is 4 mm. If D = 2 m, λ = 600 nm, then distance between slits is :

The expression of wavelength is given as, λ = 2πr/n Substitute the values.

Assertion: Distance between position of bright and dark fringe remain same in YDSE Reason: fringe width β = λD/d

In YDSE there is a point P on the screen. What is path difference at point P. Given d = 1 mm, y = 2 mm and D = 1 m

In a single slit diffraction between slit and screen is 1 m. The size of the slit is 0.7 mm & second maximum is formed at the distance of 2 mm from the centre of the screen, then find out the wavelength of light.

For Bragg's diffraction by a crystal to occur, then the X⁻ray of wavelength λ and interatomic distance d must be

The path difference is, a sin θ = \frac{5\lambda}{2} \newline a tan θ = \frac{5\lambda}{2} \quad (for small θ, sin θ \approx θ \approx tan θ) \newline a \left(\frac{y}{D}\right) = \frac{5\lambda}{2} \newline \lambda = \frac{2ay}{5D} \newline Substitute values,

Light from two coherent sources of the same amplitude A and wavelength λ illuminates the screen. The intensity of the central maximum is I₀. If the sources were incoherent, the intensity at the same point will be

For dark fringe,

An interference pattern is observed by Young’s double slit experiment. If now the separation between the coherent sources is halved and the distance of the screen from the coherent source is double, the now fringe width

If the intensities of two interfering beams in Young’s double slit experiment are I₁ and I₂ then the contrast between the maximum and minimum intensities are good when

In the given Figure, C is the middle point of line $S_1S_2$. A monochromatic light of wavelength $\lambda$ is incident on the slits. The ratio of intensities of $S_3$ and $S_4$

The Young’s double slit experiment is performed with blue and green lights of wavelength 4360 Å and 5460 Å respectively. If x is the distance of 4^{th} maxima from the central one, then

In a Fraunhofer diffraction at single slit of width d with incident light of wavelength 5500 Å, the first minimum is observed, at angle 30°. The first secondary maximum is observed at an angle θ =

The intensity ratio of the maxima and minima in an interference pattern produced by two coherent sources of light is 9 : 1. The intensities of the used light sources are in ratio

The two coherent sources with intensity ratio \( \beta \) produce interference. The fringe visibility will be

Assertion: In YDSE bright and dark fringe are equally spaced. Reason: It only depends upon phase difference.

For Bragg’s diffraction by a crystal to occur, then the X⁻ray of wavelength λ and interatomic distance d must be

Two sinusoidal waves of intensity I having same frequency and same amplitude interferes constructively at a point. The resultant intensity at a point will be

In Young's double slit experiment, fringe order is represented by m, then fringe width is

In an interference, the intensity of two interfering waves are I and 4I respectively. They produce intensity at two points A and B with phase angle of π/2 and π respectively. Then difference in between them is

In a single slit diffraction with λ = 500 nₘ and a lens of diameter 0.1 mm then width of central maxima, obtain on screen at a distance of 1 m will be

Which out of following, cannot produce two coherent sources?

In Young's double slit experiment, the two slits act as coherent sources of equal amplitude a and of wavelength λ. In another experiment with the same set up, the two slits are sources of equal amplitude a and wavelength λ, but are incoherent. The ratio of intensities of light at the mid point of the screen in the first case to that in the second case is

In Young's double slit experiment, the distance between two slits is made three times then the fringe width will become

Light is incident normally on a diffraction grating through which the first diffraction is seen at 32°. In this case the second order diffraction will be

Assertion: X⁻rays can penetrate through the flesh but not through the bones. Reason: The penetrating power of X⁻rays depends on voltage.

If the highest modulating frequency of the wave is 5 kHz, the number of stations that can be accomodated in a 150 kHz bandwidth ?

Assertion : A white source of light during interference forms only white and black fringes. Reason : Width of fringe is inversely proportional to the wavelength of the light used.

Which of the following diagrams represents the variation of electric field vector with time for a circularly polarized light?

A monochromatic beam of light is used for the formation of fringes on the screen by illuminating the two slits in the Young’s double slit interference experiment. When a thin film of mica is interposed in the path of one of the interfering beams then

When a compact disc is illuminated by a source of white light, coloured lines are observed. This is due to

Two coherent monochromatic light beams of amplitude 3 and 5 units are superposed. The maximum and minimum possible intensities in the resulting beams are in the ratio