A layer of colourless oil spreads on water surface. White light is incident on it and due to interference the oil appears coloured. In order to observe this effect the thickness of oil layer must […]
Two waves of same amplitude superpose. The resultant intensity is I₁ when they are coherent and I₂ when they are non-coherent. The ratio of I₁ and I₂ will be
Options
(a) (1:1) (b) […]
In Young’s double slit experiment, the intensity of light coming from the first slit is double the intensity from the second slit. The ratio of the maximum on the interference fringe pattern observed is
In Young’s double slit experiment, the wavelength of the light used is doubled and distance between two slits is made half of initial distance. The resultant fringe width becomes
Options
(a) 2 times […]
In Young’s double silt experiment if the distance between the two slits is made half, then the fringe width will become
Options
(a) Half (b) Double (c) One fourth (d) Unchanged
Correct Answer: […]
The frequency of light ray having the wavelength 3000Å is
Options
(a) 9×10¹³ cycle/sec (b) 10¹⁵ cycle/sec (c) 90 cycle/sec (d) 3000 cycle/sec
Correct Answer:
10¹⁵ cycle/sec
Explanation:
n = v / λ = […]
When one of the slits of Young’s experiment is covered with a transport sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be […]
The coherence of two light sources means that the light waves emitted have
Options
(a) Same frequency (b) Same intensity (c) Constant phase difference (d) Same velocity
Correct Answer:
Constant phase difference
Explanation:
Constant […]
Huygen’s principle of secondary wavelets may be used to
Options
(a) Find the velocity of light in vacuum (b) Explain the particle behaviour of light (c) Find the new position of the wave […]
Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to minimum intensity is 25:1. The intensities of the sources are in the ratio
Options
(a) (25:1) (b) […]
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