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Light Test - 32
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Why does a red coloured object seem to be red?
    Solution

  • Question 2
    1 / -0
    Image formed by a plane mirror is
    a) of same size as that of object
    b) at the same distance behind the mirror as the object in front
    c) erect, virtual
    Mark the correct statements:
    Solution
    The image formed by a plane mirror is of the same size as that of the object and is formed at the same distance behind the mirror as the object is in front of the mirror and the image formed is virtual, erect, and laterally inverted.
  • Question 3
    1 / -0
    The image formed by a plane mirror is:
    Solution
    The image formed by a plane mirror is always virtual, erect, and behind the mirror.
  • Question 4
    1 / -0
    If you write your name or any other word or sentence on a piece of paper and hold it in front of a plane mirror, how does it appear in the mirror?
    Solution
    Lateral inversion is the real or apparent reversal of left and right. For example, the letter b when laterally inverted becomes the letter d (more or less). It is well-known that a plane mirror causes the apparent lateral inversion of objects.
  • Question 5
    1 / -0
    Study the given ray diagrams and select the correct statement from the following:

    Solution
    In the first case, The ray of light is converging, when passing from lens X, so it is a convex lens.
    In the second case, the ray of light is diverging, when getting reflected from the mirror Y, so it is a concave mirror.
  • Question 6
    1 / -0

    Two bodies A and B are moving, towards a plane mirror with speeds vAv_A  and vBv_B respectively as shown in the figure. The speed of image of A respect to the body B is

    Solution
    As seen from the image, object BB and image of AA will be on the same line, thus for relative speed between them 
    VBAi=VB+VAV_{BAi}=V_{B}+V_{A}

  • Question 7
    1 / -0
    Which one of the following does not use concave mirror?
    Solution
    Convex mirror is used as rearview mirrors in cars.
  • Question 8
    1 / -0
    If two plane mirrors be kept at an angle of 1200  120^{0}  to each other, the number of images of a  object, kept between the two mirror is 
    Solution
    The number of images formed between two mirrors kept at some angles is given as

    n=(360θ)1n = \left( {\dfrac{{360^\circ }}{\theta }} \right) - 1

    Where nn is the number of images and θ\theta is the angle between the mirrors.

    Given that the angle between the mirrors is θ =120\theta  = 120^\circ , hence

    n=(360120)1n = \left( {\dfrac{{360^\circ }}{{120^\circ }}} \right) - 1

    n=31n = 3 - 1

    n=2n = 2 .

  • Question 9
    1 / -0
    As shown above, an object is placed on the left side of a cpnvex lens(beyond its focus) with its focal points labeled as FF. A flat mirror is placed at the right side focal point, with its reflecting surface facing the lens. The image of the object after refraction and reflection is at 

  • Question 10
    1 / -0
    How many images will be formed if two mirrors are fitted on adjacent wall and one mirror on roof?
    Solution

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