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CBSE Questions for Class 12 Medical Physics Wave Optics Quiz 15 - MCQExams.com

In a Young's double slit experiment sources of equal intensities are used. Distance between slits is d and wavelength of light used is λ(λ<<d), Angular separation of nearest points on either side of central maximum where intensities become half of the maximum value is
  • λd
  • λ2d
  • λ4d
  • λ6d
The YDSE apparatus is as shown in figure below. The condition for point P to be a dark fringe is (λ= wavelength of light waves) :
1756913_c05bf8a328a64886896ff533b9334c80.jpg
  • (l1l3)+(l2l4)=nλ
  • (l1l2)+(l3l4)=nλ
  • (l1+l3)(l2+l4)=(2n1)λ2
  • (l1+l2)(l2+l3)=(2n1)λ2
Unpolarised light beam of intensity I0 is incident on polaroid P1. The three polaroids are arranged in such a way that transmission axis of P1 and P3 are perpendicular to each other. Angle between the transmission axis of P2 and P3 is 60. The intensity of the beam coming out from P3 will be
1613187_2f0c4dac5c4541f5abd04e558730ed5c.png
  • I02
  • 3I08
  • 3I032
  • 3I064
A monochromatic beam of light falls on Young's double slit experiment apparatus as shown in figure. A thin sheet of glass is inserted .in front of lower slit S2. If central bright fringe is obtained on screen at O.
1757037_4bee1b54c49443b3a48e3b9a593a7417.jpg
  • (μ1)t=dsinθ
  • (μ1)t=dcosθ
  • (μ1)t+dsinθ=0
  • tμ1=dsinθ
If the plate is heated so that it temperature rises by 10C, then how many fringes will cross a particular point on the screen? (Neglect the thermal expansion of plate):
  • 1000
  • 104
  • 5000
  • 13000
One of the two slits in YDSE is painted over, so that it transmits only light waves having intensity half of the intensity of the light waves through the other slit. As a result of this
  • fringe pattern disappears
  • bright fringes become brighten and dark one becomes darker
  • dark and bright fringes get fainter
  • dark fringes get brighter and bright fringes get darker
The maximum intensity in Young's double-slit experiment is I0. Distance between the slits is d=5λ, where λ is the wavelength of monochromatic light is used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D=d ?  
  • I02
  • 34I0
  • I0
  • I04
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)
  • 0.853
  • 8.53
  • 0.75
  • 7.5
In YDSE, if a bichromatic light having wavelengths λ1 and λ2 is used, then the maxima due to both lights will overlap at a certain distance y of from the central maxima. Take separation between slits as d and distance between screen and slit as D. Then, the value y will be
  • (λ1+λ22D)d
  • λ1λ22D×2d
  • LCM of λ1Dd and λ2Dd
  • HCF of λ1Dd and λ2Dd
When the object is self-luminous, the resolving power of a microscope is given by the expression 
  • 2μsinθ1.22λ
  • μsinθ1λ
  • 2μcosθ1.22
  • 2μλ
Coherent sources are characterized by the same
[KCET 1993]
  • Phase and phase velocity
  • Wavelenght, amplitude and phase velocity
  • Wavelenght, amplitude and frequency
  • Wavelenght and phase
In a Young's double slit experiment with a source of light of wavelength 6320oA, the first minima will occur when
  • Path difference is 9480oA
  • Phase difference is 2π radian
  • Path difference is 6320oA
  • Phase difference is π radian
In Young's double slit experiment the source S and the two slits A and B are vertical with slit A above slit B. The fringes are observed on a vertical screen K. The optical path length from S to B is increased very slightly ( by introducing a transparent material of higher refractive index) and the optical path length from S to A is not changed, as a result the fringe system on K moves 
  • Vertically downward slightly
  • Vertically upwards slightly
  • Horizontally, slightly to the left
  • Horizontally, slightly to the right
A 20 cm length of a certain solution causes right-handed rotation of 38o. A 30 cm lemgth of another solution causes left-handed rotation of 24o. The optical rotation caused by 30 cm length of a mixture of the above solution is the volume ration 1:2 is
  • Left handed rotation of 14o
  • Right handed rotation of 14o
  • Left handed rotation of 3o
  • Right handed rotation of 3o
0:0:1


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