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Light Test - 7

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Light Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0

    In our houses, which of the following is used for looking at ourselves?

    Solution

    We use plane mirrors to see ourselves, because the image formed by a plane mirror is virtual, erect and of the same size.

  • Question 2
    1 / -0

    Which of the following statements is true?

    Solution

    When a light ray is reflected from the reflecting surface, the incident ray, the reflected ray and the normal lie in the same plane. The angle of incidence = The angle of reflection.

  • Question 3
    1 / -0

    What happens in lateral inversion?

    Solution

    The image formed by the plane mirror is laterally inverted i.e., the right side of the object appears on the left side of the image and left side of the object appears on the right side of the image.

  • Question 4
    1 / -0

    In a periscope, how are the reflecting mirrors arranged?

    Solution

    The two reflecting, plane mirrors arranged in a periscope are parallel to each other. The light ray from the object is incident on the first plane mirror at an angle of 45

     and the reflected ray is incident on the second mirror at 45 and is then reflected at 45, which finally reaches the retina of the eye.

  • Question 5
    1 / -0

    What is the nature of image formed on the retina of human eye of an object?

    Solution

    The human eye serves as a convex lens. It forms real, inverted and diminished image of an object.

  • Question 6
    1 / -0

    Identify the value of persistence of vision.

    Solution

    Persistence of vision is a phenomenon where the brain continues to sense the image even after the object has been removed. This lasts for 1/16th of a second.

  • Question 7
    1 / -0

    The characteristics of an eye disease are given below.

    (i) Eye sight becomes foggy

    (ii) Eye lens becomes cloudy

     

    (iii) There is a loss of vision

    In which of the following are the above characteristics observed?

    Solution

    Cataract occurs in old age due to the given characteristics and can be cured by introducing a new artificial lens.

  • Question 8
    1 / -0

    Which of the following is the requirement of nocturnal animals like owl an bat?

    Solution

    The nocturnal animals need more light to see at night. The large cornea and pupil allow more light to enter into their eyes. They also have retina with large number of rods.

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