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qUESTIONS

In young’s double slit experiment, the two slits are ‘d’ distance apart. Interference pattern is observed on the screen at a distance ‘D’ from the slits. First dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of the light is

A light wave of wavelength ‘λ’ is incident on a slit of width ‘d’. The resulting diffraction pattern is observed on a screen at a distance ‘D’. If linear width of the principal maximum is equal to the width of the slit, then the distance D is

In a Fraunhofer diffraction at a single slit of width ‘ď and incident light of wavelength 5500 Å, the first minimum is observed at an angle 30°. The first secondary maxima is observed at an angle θ

Two waves are superimposed whose ratio of intensities is 9:1. The ratio of maximum and minimum intensity is

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

Two beams of light of intensities ‘I’ and ‘4I’ produce interference pattern on a screen. The phase difference between the beams is π/2 at a point ‘A’ on the screen and ‘π’ at point ‘B’ on same screen. The difference between the resultant intensities at ‘A’ and ‘B’ is

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

In Young’s experiment the wavelength of red light is 7.8×10^-5 cm and that of blue light 5.2×10^−2 cm. The value of n for which (n+1)th blue bright band coincides with nth red band is

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