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qUESTIONS

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

On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If n=1.5, the thickness of the film is (wavelength of monochromatic light is λ)

In Young’s double slit experiment, wavelength of light used is ‘λ’. The intensity at a point is ‘I’, where the path-difference is ‘λ/3’. If Io denotes the maximum intensity, the ratio I/Io is

The interference pattern is obtained with two coherent light sources of intensity ratio ‘n’. The ratio (Imax-Imin / Imax +Imin) will be

The thickness of a plate having refractive index ‘u’ which will produce a change in optical path equal to half the wavelength ‘λ’ of the light passing through it is

If the ratio of the intensities of two waves producing interference is 49:16, then the ratio of the resultant maximum intensity of minimum intensity will be

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

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