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Human Eye and Colourful World Test - 45

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Human Eye and Colourful World Test - 45
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  • Question 1
    1 / -0
    Why do high rise buildings have a red light on the top of the building?
    Solution
    Red light is the least scattered by fine particles, fog or smoke present in the atmosphere which makes it easier to detect it clearly and distinctly so that pilot gets notification that there is some object and avoid  from any collision.
  • Question 2
    1 / -0
    Very fine particles mainly scatter _____ light.
    Solution
    The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. These are more effective in scattering light of shorter wavelengths at the blue end.
  • Question 3
    1 / -0
    The following conditions are seen in which defect of vision?
    a. The vision is clear up to a distance of few meters
    b. It may occur due to elongation of eyeball
    c. The image of the object is formed in front of the retina
    Solution
    A person with myopia cannot see distant objects distinctly since the far point for that person is nearer than infinity. Such a person may see clearly up to a distance of a few meters. In this condition, the image of a distant object is formed in front of the retina and not on the retina itself. This defect may arise either due to excessive curvature of the eye lens or elongation of the eyeball. A concave lens of suitable power can correct this defect.

  • Question 4
    1 / -0
    The color of scattered light depends on ____ of the scattering particles.
    Solution
    The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. These are more effective in scattering light of shorter wavelengths at the blue end. Whereas, larger particles scatter light of longer wavelengths at the red end.
  • Question 5
    1 / -0
    Which of the following are examples of scattering of light?
    Solution
    The molecules of water and other fine particles in the atmosphere scatter light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. Thus, when sunlight passes through water and air, the fine particles scatter the blue color more strongly than red. This scattered blue light enters our eyes and makes the ocean and sky appear blue. Near the horizon sunlight passes through thicker layers of air having larger particles that scatter light of longer wavelength such as the red end of the spectrum. Also it travels larger distance at horizon causing most of the light of shorter wavelength at the blue end of the spectrum to scatter away by the small particles of the atmosphere before reaching the earth.
    Option D.
  • Question 6
    1 / -0
    Why does the sky appear blue?
    Solution

  • Question 7
    1 / -0
    Why does sun appear reddish at sunrise and sunset?
    Solution
    Near the horizon sunlight passes through thicker layers of air having larger particles that scatter light of longer wavelength such as the red end of the spectrum. Also it travels larger distance at horizon before reaching the earth. However, light from the Sun overhead travels relatively shorter distance. At noon, the Sun appears white as only a little of the blue color is scattered whereas, near the horizon, most of the light of shorter wavelength at the blue end of the spectrum are scattered away by the small particles of the atmosphere. Therefore, the light that reaches our eyes is of longer wavelength which gives rise to the reddish appearance of the Sun.
  • Question 8
    1 / -0
    The phenomenon of dispersion proves that:
    Solution
    The splitting of white light into its constituent colours as it passes through a refracting medium (such as prism) is known as dispersion. The phenomenon of dispersion shows that white light is made up of seven constituent colours.
  • Question 9
    1 / -0
    Maximum and minimum scattering in visible range are respectively:
    Solution
    Violet light scatters the most while red light scatters the least because violet has shorter wavelength and red light has larger.
  • Question 10
    1 / -0
    Very fine particles scatter:
    Solution
    The color of the scattered light depends on the size of the scattering particles. Very fine particles scatter mainly blue light because blue has the shortest wavelength, while particles of larger size scatter light of longer wavelengths.
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