What happens if one of the slits, say S1 in Young's double , slit experiment-is covered with a glass plate which absorbs half the intensity of light from it?
  • The bright fringes become less-bright and the dark fringes have a finite light intensity
  • The bright fringes become brighter and the dark fringes become darker
  • The fringe width decreases
  • No fringes will be observed
What happens to the interference pattern the two slits S1 and S2 in Young's double experiment are illuminated by two independent but identical sources?
  • The intensity of the bright fringes doubled
  • The intensity of the bright fringes becomes four times
  • Two sets of interference fringes overlap
  • No interference pattern is observed
What is the reason for your answer to the above question?
  • The two sources do not emit light of the same wavelength
  • The two sources emit waves which travel with different speeds
  • The two sources emit light waves of different amplitudes
  • There is not constant phase difference between the waves emitted by the two sources
A single slit diffraction pattern is obtained using a beam of red light What happened the red light is replaced by the blue light?
  • There is no change in diffraction pattern
  • Diffraction fringes become narrower and crowded
  • Diffraction fringes become broader and farther apart
  • The diffraction pattern disappear
When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:
  • unpolarised
  • completely plane polarised
  • partially plane polarised
  • None of the above
When a polaroid is rotated, the intensity of light does not vary. The incident light may be:
  • unpolarised
  • completely polarised
  • partially plane polarised
  • None of the above
In Young's double slit experiment, a maximum is obtained when the path difference between the interfering waves is (n ∈ l):
  • nλ
  • n \(\frac{λ}{2}\)
  • (2n + 1) \(\frac{λ}{2}\)
  • (2n - 1) \(\frac{λ}{4}\)
For sustained interference, we need two sources which emit radiations :
  • of the same intensity
  • of the same amplitude
  • having a constant phase difference
  • None of these
Two sources of light are said to be coherent when both give out light waves of the same:
  • amplitude and phase
  • intensity and wavelength
  • speed
  • wavelength and a constant phase difference
The intensity of light emerging from the two slits, in Young's experiment is in the ratio 1 :The ratio of,the intensity of the minimum to that of the consecutive maximum will be:
  • 1 : 4
  • 1 : 9
  • 1 : 16
  • 2 : 3
Poisson's bright spot was discovered by:
  • Fresnel
  • Rayleigh
  • Poisson
  • Fraunhoffer
The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :
  • green shift
  • red shift
  • violet shift
  • yellow shift
The application of Doppler effect are:
  • Doppler spectrometer
  • Doppler radius
  • Doppler velocimeter
  • All of these
Which of the following is conserved when light waves interefere?
  • phase
  • intensity
  • amplitude
  • none of these
In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):
  • nπ
  • (n + \(\frac{1}{2}\))π
  • (2n + 1)π
  • zero
The angle of minimum deviation of a prism depends upon the aggie of:
  • incidence
  • reflection
  • prism
  • none of these
he minimum value of the refractive index is:
  • zero
  • 1
  • less than 1 but not zero
  • more than 1
Polarization of light prove the :
  • corpuscular nature of light
  • quantum nature of light
  • Transverse wave nature of light
  • Longitudinal wave nature of light
Out of the following Statements which is not correct?
  • When unpolarised light passes through Nicol's prism, the emergent light is elliptically polarized
  • Nicol's prism works on the principle of double refraction and T.l.R.
  • Nicol's prism can be used both the produce and analyse polarized light
  • Calcite and Quartz are both double refracting crystal
Polaroid glasses is used in sun glasses because :
  • It reduces the light intensity to half on account of polarization
  • It is fashionable
  • It has good colour
  • It is cheaper
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