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Light Test - 12

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Light Test - 12
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Plane mirrors are arranged parallel to each other to get :
    Solution
    When plane mirrors are kept in parallel, a large number of reflected images are formed. E.g.: Mirrors in a saloon.

  • Question 2
    1 / -0
    The angle of incidence in a plane mirror is _________ angle of reflection.
    Solution
    Law of reflection states that the angle of incidence is always equal to the angle of reflection.
  • Question 3
    1 / -0
    A narrow beam of light that is moving in a defined direction is:
    Solution
    A light ray is a narrow beam of light that is moving in a defined direction. Alternatively, a beam of light consists of lot of light rays parallel to each other.
  • Question 4
    1 / -0
    The surfaces which cannot produce clear images are called :
    Solution
    The light that gets reflected at a rough and uneven surface goes in different direction, due to irregular reflection. This is the reason why a mirror whose surface is rough cannot produce clear image.
  • Question 5
    1 / -0
    The pupil of the eye changes its size to adjust for
    Solution
    The pupil of our eye is an entrance for the light rays to enter our eyes and give us the sensation of sight. 
    If too much light enters our eyes, it can be dangerous for our eyes. So, whenever the light is strong, the pupil shrinks in order to reduce the entrance of strong light and protect our eyes.
    On the other hand, if too little light enters our eyes, we don't get a clear vision. Whenever the light is weak, the pupil expands in order to increase the entrance of light and improve the vision.
    This is how the pupil of the eye changes its size to adjust for different amounts of light.
  • Question 6
    1 / -0
    .......... occurs when a light ray bounces back from a barrier.
    Solution
    Reflection occurs when a light ray bounces back from a barrier.

  • Question 7
    1 / -0
    A ray of light which bounces off the surface of mirror is called :
    Solution
    A ray of light which bounces off the surface of mirror is called reflected ray.
  • Question 8
    1 / -0
    Identify the part "D" from the shown figure of human eye : 

    Solution
    Retina is the inner layer of the eye and is a light sensitive tissue. In the figure, it is shown by D.
  • Question 9
    1 / -0
    Fill in the blank:

    The angle of incidence, in a plane mirror, is _______ the angle of reflection.
    Solution
    Angle of incident is the angle between incident rays with normal whereas angle of reflection is the angle between refracted rays with normal.
    As per the laws of reflection, for a plane mirror, the angle of incidence is equal to the angle of reflection.
  • Question 10
    1 / -0
    Identify the part "C" from the shown figure of human eye :

    Solution
    Part C in the given figure is Cornea.
    The cornea is the outermost layer of the human eye that shields the rest of the eye from germs, dust, and other harmful matter and also helps in the refraction of light inside the eye.
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