NEET Physics Wave Optics Class 12 Questions

In a double slit experiment the angular width of a fringe is found to be 0.2° on a screen placed 1 m away. The wavelength of light used is 600 nₘ. The angular width of the fringe if entire experimental apparatus is immersed in water, is Take μ_water = 4/3

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

The width of fringe is 2 mm on the screen in a double slit experiment for the light of wavelength of 400 nₘ. The width of the fringe for the light of wavelength 600 nₘ will be:

Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima will be:

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths \( \lambda_1 = 12000 \text{ Å} \) and \( \lambda_2 = 10000 \text{ Å} \). At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

A Young's double-slit experimental set up is kept in a medium of refractive index 4/3. Which maxima in this case will coincide with the 6^{th} maxima obtained if the medium is replaced by air?

A monochromatic light of frequency 500 THz is incident on the slits of a Young's double slit experiment. If the distance between the slits is 0.2 mm and the screen is placed at a distance 1 m from the slits, the width of 10 fringes will be:

In Young’s double slit experiment, light of wavelength λ passes through the double-slit and forms interference fringes on a screen 1.2 m away. If the difference between 3^{rd} order maximum and 3^{rd} order minimum is 0.18 cm and the slits are 0.02 cm apart, then λ is

Calculate the energy in joule corresponding to light of wavelength 45 nₘ. (Planck's constant, h = 6.63 × 10⁻³⁴ J/s, speed of light, c = 3 × 10⁸ m s⁻¹)

In Young's double slit experiment, using monochromatic light of wavelength λ, the intensity of light at a point on the screen where the path difference is λ, is K units. The intensity of light at a point where the path difference is λ/3 will be

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 are consistent with the principle of conservation of energy. B. Diffraction and interference are characteristics exhibited only by light waves. Choose the correct answer from the options given below:

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

The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at 22.5° from the polarization axis of one of the polaroid, is (I₀ is the intensity of polarised light after passing through the first polaroid):

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

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

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 by another monochromatic source of larger wavelength, the angular separation of fringes decreases. In the light of the above statements, choose the correct answer from the options given below:

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 observe in the same region of the screen is:

For which one of the following, Bohr model is not valid?

The Brewster's angle i_b for an interface should be:

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:

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

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 1 m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μwater = 4/3)

In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to

Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8^{th} bright fringe in the medium lies where 5^{th} dark fringe lies in air. The refractive index of the medium is nearly:

The intensity at the maximum in a Young’s double slit experiment is I₀. Distance between two slits is d = 5λ, where λ is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance, D = 10 d?

In a diffraction pattern due to a single slit of width a, the first minimum is observed at an angle 30° when light of wavelength 5000 Å is incident on the slit. The first secondary maximum is observed at an angle of

For a parallel beam of monochromatic light of wavelength 'λ' diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be

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 maxima of single slit pattern?

In Young’s double slit experiment, the intensity at a point on the screen where path difference λ is K. What will be the intensity at the point where path difference is λ/4?

A beam of light of λ = 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 bright fringe is

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:

A parallel beam of light of wavelength λ is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is: