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Ray Optics and Optical Test - 24

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Ray Optics and Optical Test - 24
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  • Question 1
    1 / -0
    At noon the sun appears white because:
    Solution
    At noon because the sun is overhead, the light is scattered the least and hence appears white. When it is overhead, it has lesser air to travel through and the scattering from dust and other particles is reduced if the distance to be travelled in air is reduced.
  • Question 2
    1 / -0
    If the behavior of light rays through a convex looking lens is shown in the figure below , then

    Solution
    A medium inverts its behaviour if placed in a medium of refractive index higher than the material of the lens.
    Thus, a converging lens diverges light if placed in a medium of higher refractive index. 
    Thus, μ2>μ {\mu}_{2} > {\mu}
  • Question 3
    1 / -0
    The bluish colour of water in deep sea is due to:
    Solution
    As we look deep into the sea in a direction away from the sun as the blue light is more scattered more than red. The light reaching our eyes has more of violet and blue and hence the deep sea appears blue.
  • Question 4
    1 / -0
    The clear sky appears blue because:
    Solution
    The scattering of light depends on the size of the dust particles and the wavelength of the light. The amount of scattering is inversely proportional to the fourth power of wavelength.
    Since, violet and blue lights get scattered more than lights of all other colours by the atmosphere the sky appears blue.
  • Question 5
    1 / -0
    The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:
    Solution
    The amount of scattering is inversely proportional to the fourth power of wavelength. And since the wavelength of red has the longest wavelength, the amount of scattering becomes smaller.
    Danger signals installed at the top of tall buildings or traffic signals are red  so that they can be easily seen from a distance.
  • Question 6
    1 / -0
    When the length of a microscope tube increases

    its magnifying power:




  • Question 7
    1 / -0
    The clear sky appears blue because:
  • Question 8
    1 / -0
    The working of optical instruments like camera,

    microscope, telescope, etc. having glass lenses is based on a phenomenon of

    light. Identify the phenomenon.




  • Question 9
    1 / -0
    Find the refractive index of glass with respect to water. The refractive indices of glass and air with respect to air are 3/23/2 and 4/34/3 respectively.
    Solution
    Refractive index of medium 11 with respect to medium 22, 1μ2=μ2μ1^1\mu_2=\dfrac {\mu_2}{\mu_1}
    Refractive index of glass with respect to air, gμa=32^g\mu_a=\dfrac {3}{2}

    Refractive index of water with respect to air,wμa=43^w\mu_a=\dfrac {4}{3}
    gμa=μaμg^g\mu_a=\dfrac {\mu^a}{\mu^g}

    wμa=μaμg^w\mu_a=\dfrac {\mu^a}{\mu^g}

    refractive index of glass with respect to water, gμw=μwμa×μaμg=gμawμa=32×34=98\therefore \text{refractive index of glass with respect to water,}\ \displaystyle ^g\mu_w=\dfrac {\mu_w}{\mu_a}\times \dfrac {\mu_a}{\mu_g}=\dfrac {^g\mu_a}{^w\mu_a}=\dfrac {3}{2}\times \dfrac {3}{4}=\dfrac {9}{8}
  • Question 10
    1 / -0
    Which is the path of rays of light when it enters with oblique incidence from water into air ?
    Solution
    According to law of refraction if a ray of light travels from denser to rarer medium it bends away from normal from its original path.
    (considering water as denser than air)

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