Question types

Wave Optics question types

313 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

313
Questions
5
Question groups
5
Question types
Sample Questions

Wave Optics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

A parallel beam of light travelling in water is incident obliquely on a glass surface. After refraction, its width
  • A
    decreases
  • increases
  • C
    remains the same
  • D
    becomes zero.

Answer: B.

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When a ray of light enters into water from air.
  • its wavelength decreases
  • B
    its wavelength increases
  • C
    its frequency increases
  • D
    its frequency decreases.

Answer: A.

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Huygens' principle is used to
  • obtain the new position of wavefront geometrically
  • B
    explain the principle of superposition of waves
  • C
    explain the phenomenon of interference
  • D
    explain the phenomenon of polarization.

Answer: A.

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Using a monochromatic light of wavelength 2 in Young's double-slit experiment, the eleventh dark fringe is obtained on the screen for a phase difference of
  • A
    $\frac{11}{2} \pi rad$
  • B
    $\frac{21}{2} \pi rad$
  • C
    $13 \pi rad$
  • $21 rrad$

Answer: D.

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If $a$ is the aperture of a telescope and 2 is the wavelength of light then the resolving power of the telescope is
  • A
    $\frac{\lambda}{1.22 a}$
  • B
    $\frac{1.22 a}{\lambda}$
  • C
    $\frac{1.22 \lambda}{a}$
  • $\frac{a}{1.22 \lambda}$

Answer: D.

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The diameter of the objective of a telescope is $10 \ cm$. Find the resolwing power of the telescope is $10 \ cm$. Find the resolving power of the telescope if the wavelength of light is $5000 \mathring A .$
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For the interference pattern to be clearly visible on the screen, the distance (D) between the slits and the screen should be much larger than the distance (d) between the two slits (S1 and S2), i.e., D » d.
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In Young’s double slit experiment what will we observe on the screen when white light is incident on the slits but one slit is covered with a red filter and the other with a violet filter? Give reasons for your answer.
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Monochromatic electromagnetic radiation from a distant source passes through a slit. The diffraction pattern is observed on a screen 2.50 m from the slit. If the width of the central maximum is 6.00 mm, what is the slit width if the wavelength is
(a) 500 nm (visible light);
(b) 50 µm (infrared radiation);
(c) 0.500 nm (X-rays)?

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A parallel beam of green light of wavelength 550 nm passes through a slit of width 0.4 mm. The intensity pattern of the transmitted light is seen on a screen which is 40 cm away. What is the distance between the two first order minima? 
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The intensity of the light coming from one of the slits in Young’s experiment is twice the intensity of the light coming from the other slit. What will be the approximate ratio of the intensities of the bright and dark fringes in the resulting interference pattern? 
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