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Wave Optics Test - 22

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Wave Optics Test - 22
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Identify which of the following color light, when passed through a double-slit opening, will produce the widest central band of light on the screen?
    Solution
    Fringe width $$\beta = \dfrac{\lambda D}{d}$$ where  $$\lambda$$ is the wavelength of the light used
    $$\implies$$  $$\beta \propto \lambda$$                  
    As wavelength of the red light is the largest among the visible light, thus fringe width is the greatest formed due to red light.
  • Question 2
    1 / -0
    When the light source is approaching, the Doppler effect for light is known as:
    Solution
    Optical light with a short wavelength is blue.  When the wavelength of the light gets shortened by Doppler effect, we refer to the change in the wavelength as blue shift. 
  • Question 3
    1 / -0
    Why do polarized sun glasses block out some reflected light (glare), but do not block out light that has not been reflected?
    Solution
    When ordinary (unpolarised) light is reflected from a surface , it gets partial polarisation , it means some of the electric vectors in some planes are cut-off . When this partially polarized light is incident on polarized glasses , glass acts as an analyser and therefore block out some reflected light .
  • Question 4
    1 / -0
    When the light source is moving away, the Doppler effect for light is known as:
    Solution
    When the wavelength of the light gets lengthened by the Doppler shift, we refer to the change as red shift. 
  • Question 5
    1 / -0
    Which experiment seemed to make it clear that light propogates as a wave?
    Solution
    Young's double slit experiment 
    The double slit experiment is a demonstration that light and matter can display characteristics of both classically defined waves and particles. Moreover it displays the fundamentally probabislistic nature of quantum mechanical phenomena
  • Question 6
    1 / -0
    Thin films like soap bubbles and oil floating on water can create colorful patterns.
    Which of the following explanations most accurately describes why this happens?
    Solution
    The reason of colourful patterns on soap bubbles and oil on water is interference. 
    Infact, the reflected waves from upper and lower surfaces, get interference and produce colourful patterns.
  • Question 7
    1 / -0
    Convex lens is not used in :
    Solution
    Convex lens always converges the parallel rays but in flood lights, we want to diverge the incident rays so as to light up more area. Thus we use a diverging lens i.e. a concave lens. Thus a convex lens is not used in flood lights.
  • Question 8
    1 / -0
    The following cannot be explained by wave nature of light
    Solution
    Photo electric effect 
    According to wave physics energy of a wave depends upon an amplitude of a wave it means that there light of any frequency can make electrons come out from metal but it did not happen, light of certain fixed frequency can make electron come out from metal. So the photoelectric effect can only be explained by particle nature of light not wave.
  • Question 9
    1 / -0
    Huygen's concept of secondary wave
    Solution
    Huygen proposed a hypothesis for the geometrical construction of the position of a common wavefront at any instant during the propagations of waves in a medium.
  • Question 10
    1 / -0
    The phenomenon of rotation of plane polarized light is called
    Solution
    The phenomenon of rotation of plane polarized light is called optical activity.
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