OneTime: Interference NAT Level - 1 - Physics MCQ
10 Questions MCQ Test - OneTime: Interference NAT Level - 1
Two slits separated by a distance of 1 mm, are illuminated with red light of wavelength 6.5 x 10-7 m. The interference fringes are observed on a screen placed 1 m from the slits. Find the distance (in mm) between the third dark fringe and the fifth bright fringe on the same side of the central maxima.
The path difference between two interfering waves at a point on the screen is λ/6. The ratio of intensity at this point and that at the central bright fringe will be : (Assume that intensity due to each slit in same)
phase difference is 
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If the distance between the first maxima and fifth minima of a double slit pattern is 7 mm and the slits are separated by 0.15 mm with the screen 50 cm from the slits, then wavelength (in nm) of the light used is :
Calculate the width (in mm) of central maxima. If light of 9000 A incidents upon a slit of width 1.5 mm. Screen is kept 150 cm away from the slit.
If the ratio of the intensity of two coherent sources is 4, then the visibility 
of the fringes is.
If the relative permitivity and relative permeability of a medium are 2 & 1.28 respectively, then refractive index of the material is.
Two lightwaves are given by 
and 
The ratio intensity of first wave to that of second wave is.
A light ray incidents on water 
surface from air and reflected part of it is found to be polarized. Find the deviation (in degrees) of refracted light from its original path :
In young’s double slit experiment, we get 60 fringes in the field of view of monochromatic light of wavelength 4000 
. If we use monochromatic light of wavelength 6000 
, then the number of fringes that would be obtained in the same field of view is.
A single slits of width 0.1 mm is illuminated by parallel light of wavelength 6000 
and diffraction bands are observed on a screen 40 cm from the slit. The distance (in mm) of third dark band from the central bright band is :
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