One slit of a double slit experiment is covered by a thin glass plate of refractive index 1.4, and the other by a thin glass plate of the refractive index 1.7. The point on the screen where the central maximum fall before the glass plate was inserted, is now occupied by what had been the fifth bright fringe was seen before. Assume the plate have the same thickness t and wavelength of light 480 nm. Then the value of t is


Correct option is



 In case of two glass plates





Light waves from two coherent sources of same intensity I interfere. The intensity of light at he minima is zero. The intensity at the maxima is


A transparent sheet of thickness 1178 mcm and refractive index 1.60 is placed in the path of the interfering beams in Young’s double slit experiment using sodium light of wavelength 5890. The centre fringe shifts to a position originally occupied by



When two coherent monochromatic light beams of intensities I and 4I are superimposed, what are the maximum and minimum possible intensities in the resulting beams


In an interference pattern the position of zeroth order maxima is 4.8 mm from a certain point P on the screen. The fringe width is 0.2 mm. The position of second maxima from point P is