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Wave Optics Quiz 5

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JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts. .

Q1. A light ray of frequency v and wavelength λ enters a liquid of refractive index 3/2. The ray travels in the liquid with
  •  Frequency v and wavelength (
    2 / 3
  •  Frequency v and wavelength (
    3 / 2
  •  Frequency v and wavelength λ
  •  Frequency (
    3 / 2
    )v and wavelength λ
Solution

Q2.Blue light of wavelength 480 nm is most strongly reflected off a thin film of oil on a glass slab when viewed near normal incidence. Assuming that the index of refraction of the oil is 1.2 and that of the glass is 1.6, what is the minimum thickness of the oil film (other than zero)?
  •  100 nm
  •  200 nm
  •  300 nm
  •  None
Solution
Q3.  Intensity observed in an interference pattern is I=I0sin2 θ. At θ=30°, intensity I=5±0.002. The percentage error in angle is
  •   4√3×10-2%
  •  
    4 / π
    x10-2%
  •  
    4√3 / π
    x10-2%
  •  √3x10-2%
Solution

Q4. In a double-slit experiment, the distance between the slits is d. The screen is at a distance D from the slits. If a bright fringe is formed opposite to a slit on the screen, the order of the fringe is
  •  
    d2 / 2λD
  •  
    d / 2λD
  •  
    d2 / 4λD
  •  0
Solution

Q5.In YDSE, the amplitude of intensity variation of the two sources is found to be 5% of the average intensity. The ratio of the intensities of two interfering sources is
  •  2564
  •  1089
  •  1681
  •  869
Solution

Q6. Light waves travel in vacuum along the -axis. Which of the following may represent the wavefront?
  •  x=constant
  •  y=constant
  • z=constant
  •  x+y+z=constant
Solution
Q7. In Young’s double-slit experiment using monochromatic light, the light pattern shifts by a certain distance on the screen when a mica sheet of refractive index μ and thickness t microns is introduced in the path of one of the interfering waves. The mica sheet is then removed and the distance between the plane of slits and the screen is double. It is found that the distance between successive maxima (or minima) now is the same as the observed fringe shift upon the introduction of the mica sheet. Calculate the wavelength of light?
  •  (1/2)t(μ-1)
  •  t(μ-1)
  •  μt
  •  3μt
Solution
Q8.Let S1 and S2 be the two slits in Young’s double-slit experiment. If central maxima is observed at P and angle ∠S1P S2=θ, then the fringe width for the light of wavelength λ will be
  •  λ/θ
  •  λθ
  •  2λ/θ
  •  λ/2θ
Solution
Q9.In Young’s interference experiment, if the slits are of unequal width, then
  •  No fringes will be formed
  •  The positions of minimum intensity will not be completely dark
  •  Bright fringe as displaced from the original central position
  •  Distance between two consecutive dark fringes will not be equal to the distance between two consecutive bright fringes
Solution
Q10. A wave front AB passing through a system C emerges as DE. The system C could be
  •  A slit
  •  A biprism
  •  A prism
  • A glass slab
Solution

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