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Human Eye and Colourful World Test - 22

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Human Eye and Colourful World Test - 22
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  • Question 1
    1 / -0
    The phenomenon due to which white light splits into seven colours on passing through a prism is called _________
    Solution
    The phenomenon due to which white light splits into seven colours on passing through a prism is called dispersion. White light is made up of seven bands of colors each having different wavelengths. Upon passing through a medium, each of the colors travels at different speeds and hence has different angles of refraction leading to the splitting of the light i.e. dispersion.
  • Question 2
    1 / -0
    The angle between the two refracting surface of a prism is called angle of:
    Solution
    The angle between the two refracting surface of a prism is called angle of prism. In an equilateral prism, this angle is $$60^o$$.

  • Question 3
    1 / -0
    A person having the nearest distance of distinct vision of $$32 \ cm$$. Uses a reading lens of $$8 \ cm$$ focal length. The magnification of his reading lens is -
  • Question 4
    1 / -0
    A prism is a piece of transparent material having _____ triangular and _____ rectangular surfaces.
    Solution
    A prism is a piece of transparent material with three rectangular (base and two refracting surfaces) and two triangular surfaces.
  • Question 5
    1 / -0
    The part which protects the human eye is called :
    Solution

    The front part of the eye that forms a transparent curved part and protects the human eye on the outside is called the cornea.

    It is shaped like a dome and protects the eye from things that could damage the inner parts. Thus, option $$A$$ is correct.

  • Question 6
    1 / -0
    Cilliary muscles in the eye:
    Solution
    The eye lens is composed of fibrous, jelly-like material. Its curvature can be modified to some extent by the ciliary muscles. The change in the curvature of the eye lens can thus change its focal length. Thus the ciliary muscles in the eye increase or decrease the focal length of the eye lens.

  • Question 7
    1 / -0
    Which of the following statements about human eye is NOT true?
    Solution


    The space between the cornea and the lens is called the aqueous chamber and is filled with thin watery transparent viscous fluid called aqueous humor. It supplies nutrients to these structures as well as to the lens. Thus, option $$C$$ is not true for human eye.

  • Question 8
    1 / -0
    In the white light of sun, maximum scattering by the air molecules present in the earth's atmosphere is for:
    Solution
    $${\Large\underline{\textbf{Concept Used:}}}$$

    $${\large{\textbf{Rayleigh Scattering}}}$$
    In the process of scattering, light rays are absorbed by the particles of a medium and remitted in random directions. When white light passes through a medium, different wavelengths are scattered differently. 
    Shorter the wavelength, the higher the chances of the light being scattered due to its high frequency.  According to Rayleigh's Theory, the intensity of scattered light in a medium is related to the wavelength as,
    $$I \propto \frac{1}{\lambda ^4}$$

    $${\Large\underline{\textbf{Correct Answer: D}}}$$

    $${\Large {\textbf{Explanation}}}$$
    $$\bullet$$ By Rayleigh's Criterion intensity of scattered light is given by, $$I \propto \frac{1}{\lambda ^4}$$
     $$\Rightarrow$$ Intensity of scattered light is more for smaller wavelengths of light.
     $$\bullet$$ In the visible spectrum, the $$blue$$ side of the spectrum has a $$smaller \ wavelength$$ compared to the red side. Hence blue light is $$scattered \ more$$ by air molecules present in earth's atmosphere.

  • Question 9
    1 / -0
    Quantity of light entering the eyes is controlled by
    Solution
    The pupil regulates and controls the amount of light of light entering the eyes, thus option $$C$$ is correct.
  • Question 10
    1 / -0
    A long-sighted eye can see:
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