115 questions asked across 17 exam years, newest first
In a Young's double slit experiment, the intensity at a point is of the maximum intensity, the minimum distance of the point from the central maximum is ______ . (Given : , , )
Answer: 200
Monochromatic light of wavelength is used in Young's double slit experiment. An interference pattern is obtained on a screen. When one of the slits is covered with a very thin glass plate (refractive index ), the central maximum is shifted to a position previously occupied by the bright fringe. The thickness of the glass-plate is ____ .
Answer: 4
A parallel beam of monochromatic light of wavelength passes through single slit of width. Angular divergence corresponding to second order minima would be ________ .
Answer: 6
Two slits are apart and the screen is located away from the slits. A light of wavelength is used. The width of each slit to obtain maxima of the double slit pattern within the central maximum of the single slit pattern is ____ .
Answer: 2
Two coherent monochromatic light beams of intensities and are superimposed. The difference between maximum and minimum possible intensities in the resulting beam is . The value of is ________.
Answer: 8
In a single slit experiment, a parallel beam of green light of wavelength passes through a slit of width . The transmitted light is collected on a screen away. The distance of first order minima from the central maximum will be . The value of is :
Answer: 275
Two wavelengths and are used in Young's double slit experiment. and . The minimum order of fringe produced by which overlaps with the fringe produced by is . The value of is ____.
Answer: 9
The width of one of the two slits in a Young's double slit experiment is 4 times that of the other slit. The ratio of the maximum to the minimum intensity in the interference pattern is:
Answer: D
A monochromatic light of wavelength is incident on the single slit of width . If the diffraction pattern is formed at the focus of the convex lens of focal length , the linear width of the central maximum is :
Answer: B
A microwave of wavelength falls normally on a slit of width . The angular spread of the central maxima of the diffraction pattern obtained on a screen away from the slit, will be :
Answer: A
In Young's double slit experiment, monochromatic light of wavelength is used. The slits are apart and screen is placed at away from slits. The distance from the centre of the screen where intensity becomes half of the maximum intensity for the first time is ________ .
Answer: 125
Two waves of intensity ratio cross each other at a point. The resultant intensities at that point, when (a) Waves are incoherent is (b) Waves are coherent is and differ in phase by . If then ____.
Answer: 13
When unpolarized light is incident at an angle of on a transparent medium from air, the reflected ray is completely polarized. The angle of refraction in the medium is:
Answer: C
Answer: 0.2
In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path difference between the two lights reaching at a point on the screen is . The ratio of intensity of fringe at this point with respect to the maximum intensity of the fringe is :
Answer: A
In a single slit diffraction pattern, a light of wavelength is used. The distance between the first and third minima in the diffraction pattern is found to be when the screen in placed away from slits. The width of the slit is _________ .
Answer: 2
A parallel beam of monochromatic light of wavelength is incident normally on a single narrow slit of width . The light is focused by convex lens on screen, placed on its focal plane. The first minima will be formed for the angle of diffraction of _______ (degree).
Answer: 30
