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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
    Nature of the image formed by a plane mirror is :
    Solution

    Explanation:

    • Image formed by a plane mirror is always virtual, laterally inverted, and erect.
    • It has always a magnification of unity and hence, the image is of the same size that of object.                                                                                                    
  • Question 2
    1 / -0
    Which of the following best describes image formation by a plane mirror? 
    Solution
    Images formed by plane mirrors are virtual, upright, left-right reversed, the same distance from the mirror as the object's distance, and the same size as the object.so,A virtual image is formed behind the mirror best describes image formation by a plane mirror.
  • Question 3
    1 / -0
    An object is kept at $$60$$cm in front of a plane mirror. If the mirror is now moved $$25$$cm away from the object, how is the image shifted from its previous position?
    Solution
    In this case, the mirror is moved 25 cm away from its initial position. Therefore, if the mirror is moved with distance x, then image in the mirror will move by distance 2x.
    That is, 2x=50 cm.
    So, the image will shift by 50 cm away from its previous position.
  • Question 4
    1 / -0
    Which of the following sources of light is different from others ?
    Solution
    $$Answer:$$ option D.
    Sunlight, white light, light from bulb when passed from prism will split into its constituent colours, i.e. spectrum will be seen.
    But when sodium light is passed, it will not show colour band since it is a monochromatic light (light having only one constituent colour). 
  • Question 5
    1 / -0
    In our houses, we use a _____________ to look at ourselves.
    Solution
    In plane mirrors the image formed is of the same size and at the same distance so the plane mirror is used.
  • Question 6
    1 / -0
    The E.N.T. (Ear, Nose, Throat) doctor uses a :
    Solution
    The E.N.T. doctors use concave mirrors because images formed by concave mirrors are larger in size than original object. 

  • Question 7
    1 / -0
    Fill in the blank:

    A _____ image is one which can be obtained on a screen.
    Solution
    A real image is one which is formed by actual convergence of rays coming from a source. Thus, if a screen is placed on the plane of convergence of rays, the image can be obtained on the screen.
  • Question 8
    1 / -0
    The image formed by a plane mirror is :
    Solution
    The properties of the image formed by a plane mirror are:
    1) The images are at the same distance behind the mirror as the object in front of it.
    2) The images are laterally inverted
    3) The images are of the same size as that of the object
  • Question 9
    1 / -0
    Image formed by a plane mirror is 
    Solution
    Answer is B.

    The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.
    To summarize, the image formed by plane mirrors are,
    1. Virtual 
    2. Behind the mirror 
    3. Erect (means not inverted) 
    4. Same size as the object 
    5. At same distance from the mirror as the object is from the mirror.

  • Question 10
    1 / -0
    What type of image is formed by a plane mirror ?
    Solution
    Images formed by plane mirrors are virtual, upright, left-right reversed, the same distance from the mirror as the object's distance, and the same size as the object.
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