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qUESTIONS

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

In Young’s double slit experiment, the slits are 3 mm apart. The wavelength of light used is 5000 Å and the distance between the slits and the screen is 90 cm. The fringe width in mm is

A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths 420 and 630 nm. The minimum thickness of the soap solution is

In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5 x 10^–2 m towards the slits, the change in fringe width is 3 x 10^–5 m. If the distance between the slits is 1 mm, then the wavelength of the light will be

The ratio of maximum and minimum intensities of two sources is 4:1. The ratio of their amplitudes is

At two points P and Q on a screen in Young’s double slit experiment, waves from slits S1 and S2 have a path difference of 0 and λ/4 respectively. The ratio of intensities at P and Q will be

In Young’s double slit experiment, angular fringe width is 0.20^∘ for sodium light of wavelength 5890^∘ A. If the complete system is dipped in water, then the angular fringe width will be (refractive index of water =4/3).

In biprism experiment, the 4 th dark band is formed opposite to one of the slits. The wavelength of light used is ( D= distance between source and screen, d= distance between the slits)

A ray of light is incident normally on a glass slab of thickness 5 cm and refractive index 1.6. The time taken to travel by a ray from source to surface of slab is same as to travel through glass slab. The distance of source from the surface is

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

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