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qUESTIONS

In an interference experiment, the phase difference between the waves reaching a dark point is

In a biprism experiment, when light of wavelength 6300 Å is used, the fringe width is 0.45 mm. With the same setting, when source of wavelength 4200 Å is used, the percentage decrease in fringe width will be

In single slit diffraction experiment, first minimum observed for wavelength ‘λ1’ coincides with first maximum obtained using wavelength ‘λ2’. If λ1= 6300 Å, then λ2 is

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

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

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

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

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

Two light waves of intensities ′I1′ and ′I2′ having same frequency pass through same medium at a time in same direction and interfere. The sum of the minimum and maximum intensities is

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