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Wave Optics Quiz-10

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 


Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 



Q91. Which of the following is not a property of light
  •  It requires a material medium for propagation
  •  It can travel through vacuum
  •  It involves transportation of energy
  •  It has finite speed
Solution
Light is electromagnetic in nature it does not require any material medium for its propagation

Q92.In a Young’s double slit experiment, distance between sources is 1 mm and distance between the screen and sources is 1 m. If the fringe width on the screen is 0.06 cm, then λ is
  •  6000 Å
  •  4000 Å
  •  1200 Å
  •  2400 Å
Solution
                     



Q93.  A star is moving away from the earth with a velocity of 100 km/s. If the velocity of light is 3×108 m/s then the shift
of its spectral line of wavelength 5700 Å due to Doppler’s effect will be
  •   0.63Å
  •  1.90Å
  •  3.80Å
  •  5.70Å
Solution
                          


Q94. 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-1.5) 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
Solution
                            

Q95.In the Young’s double slit experiment, the central maxima are observed to beI0. If one of the slits is covered, then the intensity
at the central maxima will become
  •  I0/2
  •  I/√2
  •  I0/4
  •  I0
Solution
 Intensity, I0=I1+I2+2 √(I1 I2 )
If I1=I2=I(Let)
Then I0=4I
When one slit is covered then I2=0
∴I0'=I=I0/4


Q96. Brewster’s angle in terms of refractive index (n) of the medium
  •  tan-1[√n]
  • sin-1[n]
  •  sin-1⁡[√n]
  •  tan-1[n]
Solution
Refractive index of a medium n=tan⁡ip Where ip= Brewster’s angle ⇒ip=tan-1⁡[n]

Q97.A slit of width a is illuminated with a monochromatic light of wavelength λ from a distant source and the diffraction pattern
is observed on a screen placed at a distance D from the slit. To increase the width of the central maximum one should
  •  Decrease D
  •  Decrease a
  •  Decrease λ
  •  The width cannot be changed
Solution
Width of the central maximum,
β0=2Dλ/a
β0∝1/a
∴ To increase the width of the central maximum one should decrease a.


Q98. Consider the following statements in case of Young’s double slit experiment. I. A slit S is necessary if we use an ordinary extended source of light. II. A slit S is not needed if we use an ordinary but well collimated beam of light. III. A slit S is not needed if we use a spetially coherent source of light. Which of the above statement are correct?
  •  (i)And (iii)
  •  (ii) and (iii)
  •  (i)and (ii)
  •  (i), (ii) and (iii)
Solution
(i)And (iii)

Q99.In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the slits.
If the screen is moved by 5×10-2 m towards the slits, the charge in fringe width is 3 ×10-5 m. If separation between the slits
is 10-3 m, the wavelength of light used is
  •  6000 Å
  •  5000 Å
  •  3000 Å
  •  4500 Å
Solution
                                 



Q100. Direction of the first secondary maximum in the Fraunhoffer diffraction pattern at a single slit is given by (a is the width of the slit)
  •  a sin⁡θ=λ/0
  •  a cos⁡θ=3λ/2
  • a sin⁡θ=λ
  •  a sin⁡θ=3λ/2
Solution
                           


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