JEE Questions for Physics Wave Optics Quiz 2 - MCQExams.com

If white light is used in the Newton's rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to
  • 90° change of phase in one of the reflected waves
  • 180° change of phase in one of the reflected waves
  • 145° change of phase in one of the reflected waves
  • 45° change of phase in one the reflected waves
The distance between the first dark and bright band formed in Young's double slit experiment with bandwidth B is

  • Physics-Wave Optics-95291.png
  • B

  • Physics-Wave Optics-95292.png

  • Physics-Wave Optics-95293.png
In a Fresnel biprism experiment, the two positions of lens give separation between the slits as 16 cm and 9 cm, respectively. What is the actual distance of separation?
  • 12.5 cm
  • 12 cm
  • 13 cm
  • 14 cm
In Young's double slit experiment, first slit has width four times the width of the second slit. The ratio of the maximum intensity to the minimum intensity in the interference fringe system is
  • 2 : 1
  • 4 : 1
  • 9 : 1
  • 8 : 1
If white light is used in Young's double slit experiment
  • no interference pattern is formed
  • white fringes are formed
  • central bright fringe is white
  • central bright fringe is coloured
In the diffraction pattern of a single slit
  • all bands are uniformly bright
  • all bands are uniformly wide
  • central band is narrower
  • central band is wider
In which of the following is the interference due to the division of wavefront ?
  • Young's double slit experiment
  • Fresnel's biprism experiment
  • Liyod's mirror experiment
  • Demonstration colours of thin film
A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then
  • no interference is observed
  • fringe width increases
  • fringe width decreases
  • fringe width remains same
A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is
  • hyperbola
  • circle
  • straight line
  • parabola
In the phenomenon of interference, energy is
  • destroyed at bright fringes
  • created at dark fringes
  • conserved but it is redistributed
  • same at all points
In Young's double slit experiment, the aperture screen distance is 2 m. The slit width is 1 mm. Light of 600 nm is used. If a thin plate of glass(μ =1.of thickness 0.06 mm is placed over one of the slits, then there will be a lateral displacement of the fringes by
  • zero
  • 6 cm
  • 10 cm
  • 15 cm
A single slit is used to observe diffraction pattern with red light. On replacing the red light with violet light the diffraction pattern would
  • remain unchanged
  • become narrower
  • become broader
  • disappear
A beam of light wavelength 600 nm from a source falls on single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is
  • 2.4 cm
  • 2.4 mm
  • 1.2 cm
  • 1.2 mm
In single slit experiment, the width of the slit is reduced. Then, the linear width of the principal maxima
  • decreases but becomes less bright
  • increases but becomes less bright
  • decreases but becomes more bright
  • increases but becomes more bright
A grating which would be most suitable for constructing a spectrometer for the visible and ultraviolet region, should have
  • 100 lines/cm
  • 1000 lines/cm
  • 10000 lines/cm
  • 100000 line/cm
In single slit diffraction pattern
  • central fringe has negligible width than others
  • all fringes are of same width
  • central fringes do not exist
  • None of the above
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern, the phase difference between the rays coming from the edges of the slit is
  • 0
  • π/2
  • π
  • 2π
Two luminous point sources separated by a certain distance are at 10 km from an observer. If the aperture of his eye is 2.5 × 10-3 m and the wavelength of light used is 500 nm, the distance of separation between the point sources just seen to be resolved is
  • 12.2 m
  • 24.2 m
  • 2.44 m
  • 1.22 m
Maximum diffraction takes place in a given slit for
  • γ - rays
  • ultraviolet light
  • infrared light
  • radiowaves
In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then
  • Fringes will become narrower
  • fringes will become broader
  • no change in fringe width
  • None of the above
The size of an obstacle in order to observe diffraction of light must be
  • of any order
  • of the order of wavelength
  • much larger than wavelength
  • much smaller than wavelength
Which of the following cannot be polarised?
  • Ultraviolet rays
  • Ultrasonic waves
  • X - rays
  • Radiowaves
Which of the following is a dich roic crystal?
  • Quartz
  • Tourmaline
  • Mica
  • Selenite
The angle of incidence of light is equal to Brewster's angle, then
  • reflected ray is perpendicular to refracted ray
  • refracted ray is parallel to reflected ray
  • reflected light is polarised having its electric vector in the plane of incidence
  • refracted light is polarised
In the propagation of light waves, the angle between the direction of vibration and plane of polarisation is
  • 0°
  • 90°
  • 45°
  • 80°
The phenomenon of polarisation of light indicates that
  • light is a longitudinal waves
  • light is a transverse waves
  • light is not a waves
  • light travels with the velocity of 3 × 108 ms -1
A polarised light of intensity I0 is passed through another polariser whose pass axis makes an angle 60o with the pass axis of the former. What is the intensity of emergent polarised light from second polariser?
  • I = I0
  • I = I0 / 6
  • I = I0 / 5
  • I = I0 / 4
Let you be sitting in sun for 2.5 hours. The area of your body exposed normally to sun rays is 1.3 m2. The intensity of sun rays is 1.1k W/m2 . If your body completely absorbs the sun rays, Then the momentum transferred to your body will be (in kg.m/s}
  • 0.043
  • 0.037
  • 0.61
  • 0.91
The correct formula for frings visibility is

  • Physics-Wave Optics-95298.png
  • 2)
    Physics-Wave Optics-95299.png

  • Physics-Wave Optics-95300.png

  • Physics-Wave Optics-95301.png
Two independent waves are expressed as y1 = a1 sin ω1t and y2 = a2 sin ω2 t. whether interference is possible with these
  • Yes
  • No
  • sometimes possible and sometimes not,
  • nothing can be predicted
In a Fresnel Biprism experiment, the two positions of lens give separation between the slits as 16 cm and 9 cm respectively. What is the actual distance of separation ?
  • 12.5 cm
  • 12.0 cm
  • 13 cm
  • 14 cm
The interference fringes formed by a thin oil film on water are seen in yellow light of sodium lamp . We find the fringes
  • coloured
  • black and white
  • yellow & black
  • coloured without yellow
In young’s double slit expt., angular width of a fringe formed on a distant screen is 1o. The wavelength of light used is 6000 Å . What is the separation between the slits ?
  • 0.0172 cm
  • 0.0086 cm
  • 0.0344 mm
  • none of these
Which of the following is NOT essential for two sources of light in Young’s double slit experiment to produce a sustained interference ?
  • Equal wavelength
  • Equal Intensity
  • Constant phase relationship
  • Equal frequency
The velocity of light in diamond (vd), in glass (vg) and in water (vw) is such that
  • vw > vg > vd
  • vd > vg > vw
  • vd > vw > vg
  • vw > vd > vg
Two waves having the intensities in the ratio of 9 : 1 produce interference. The ration of maximum to minimum intensity is equal to
  • 10.8
  • 9 : 1
  • 4 : 1
  • 2 : 1
Ratio of intensities of two waves is given by 4 : 1. Then ratio of the amplitude of the two waves is
  • 2 : 1
  • 1 : 2
  • 4 : 1
  • 1 : 4
The correct relation between the size of the obstacle and wavelength of light in order to observe the diffraction event is

  • Physics-Wave Optics-95308.png
  • 2)
    Physics-Wave Optics-95309.png

  • Physics-Wave Optics-95310.png

  • Physics-Wave Optics-95311.png
Diffraction pattern is obtained using red light. What will happen if it is replaced by violet light?
  • Bands will disappear
  • Bands will become narrow
  • Bands will get spaced apart
  • Bands will remain unchanged.
The limit of resolution of eye is approximately
  • 1o angle
  • 1’ angle
  • 1 mm
  • 1 cm
A plane wave of wavelength 6250 Å is incident normally on a slit of width 2 × 10-2 cm. The width of the principal maximum on a screen distant 50 cm will be
  • 312.5 × 10-3 cm
  • 31.25 × 10-3 cm
  • 312 cm
  • 312.5 × 10-3 mm
A light beam is incident at θ on an interface of air glass such that angle between reflected and refracted beam is 900. Then θ is
  • tan-1 (3/2)
  • tan-12
  • tan-1 (3/4)
  • tan-1 (4/3).
Out of the following statements which is not correct
  • when unpolarised light passes through a Nicol’s prism, the emergent light is elliptically polarised
  • Nicol’s prism works on the principle of double refraction and total internal reflection
  • Nicol’s prism can be used both, to produce and analyse polarised light
  • Calcite and Quartz are both, doubly refracting crystals.
Polaroid glass is used in sun glasses because
  • it reduces the light intensity ot half on account of polarization
  • it is fashionable
  • it has good colour
  • it is chapter
What changes on polarization of light ?
  • Frequency
  • Wavelength
  • Phase
  • Intensity
When light is incident at polarizing angle, which is completely polarised ?
  • reflected light
  • refracted light
  • both
  • neither
A beam of unpolarised light passes through a tourmaline crystal A and then through another such crystal B oriented so that its principal plane is parallel to A. The intensity of emergent light is I0. Now B is rotated by 45o about the ray.The emergent light will have intensity
  • I0/2
  • I0/√2
  • I0√2
  • 2I0
The time period of rotation of the sun is 25 day s and its radius is 7 × 108 m. the Dopper shift for the light of wavelength 6000Å emitted from the surface of the sun will be
  • 0.04 Å
  • 0.4 Å
  • 4.00 Å
  • 40.0 Å
The expression for apparent frequency of light when a source is moving towards earth is

  • Physics-Wave Optics-95317.png
  • 2)
    Physics-Wave Optics-95318.png

  • Physics-Wave Optics-95319.png

  • Physics-Wave Optics-95320.png
Which of the following is used in optical fibres?
  • total internal reflection
  • scattering
  • reflection
  • interference
0:0:1


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