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Light Test - 41

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Light Test - 41
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  • Question 1
    1 / -0
    How are things visible to us?
    Solution
    The light coming from the source falls on the object and reflects back into our eyes and our eye lens form an image of it which is virtual and inverted..but our brain interprets correctly..so we see the objects.
  • Question 2
    1 / -0
    Mark the incorrect statement:
    Solution
    Option A is correct.

    In Option B, we all know that light always travel in a straight line and mirror changes the direction of light falling on it.

    Now option C:
    Things are only visible when light from our eyes reaches the object, This statement is incorrect because light never comes from our eyes. Our eyes are not a source of light. They only detect the light getting reflected from the objects.

  • Question 3
    1 / -0
    When a light ray falls on a perfectly reflective mirror at an angle. Identify which of the following statement is true about the ray?
    Solution
    When a light ray falls on a perfectly reflective mirror at some angle, then only the direction of the light rays changes such that the angle of incidence is equal to the angle of reflection but the frequency, wavelength, time period and the velocity of the light remain constant.
    Thus option E is correct.
  • Question 4
    1 / -0
    A beam of incident light rays falls onto the glass plate. Possible angles for the reflected and refracted rays are shown as E,D,C,B &A in the figure above.
    Identify which of the following best represents the reflected ray?

    Solution
    According to laws of reflection, The angle of incidence=The angle of reflection\text{The angle of incidence}=\text{The angle of reflection}
    From the figure, the angle of reflection made by ray E is almost equal to the angle of incidence.
    Thus the best possible reflected ray is E.
  • Question 5
    1 / -0
    Which of the following phenomenon has two angles that are equal to each other?
    Solution
    According to laws of reflection, The angle of incidence=The angle of reflection\text{The angle of incidence}=\text{The angle of reflection}
    Hence option A is correct.
  • Question 6
    1 / -0
    The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
    Solution
    The human eye can focus objects at different distances by adjusting the focal length of eye lens due to the power of accomodation of human eye.
  • Question 7
    1 / -0
    Which surfaces will reflects most of the light falling on them?
    Solution
    A perfect smooth and shiny surface will reflect most of the light falling on them.
  • Question 8
    1 / -0
    In a periscope, the reflecting mirrors will be:
    Solution
    From the ray diagram we can observe that both the plane mirrors used in a periscope are parallel to each other.

  • Question 9
    1 / -0
    Which of the following does not lie in the plane of reflection ?
    Solution
    Reflecting surface is perpendicular to the plane of reflection so it does not lie in the plane of reflection.

  • Question 10
    1 / -0
    Reflection from a smooth surface is called __________ reflection.
    Solution
    Regular reflection is reflection in which a parallel beam of incident rays is reflected as a parallel beam.

    Reflection from smooth surface is regular reflection.

    Answer-(A)
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