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Light Test - 14

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Light Test - 14
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Weekly Quiz Competition
  • Question 1
    1 / -0
    When the Newton's disc is rotated what happens
    Solution
    Newton's colour disc, as the name suggests, was invented by Sir Issac Newton and is a disc with seven segments in rainbow colours.
    When the disc is rotated, the colours fade to white. In this way, Sir Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow.

    Hence, the correct answer is OPTION A.
  • Question 2
    1 / -0
    What is a virtual image?
    Solution
    Hint:
    The virtual image is formed by the imaginary light rays. The imaginary light rays do not form the image on the screen.
    Step 1: Explaining the image formation,
    \bulletWhen the actual rays diverge then they can never meet to form an image. Therefore the rays are assumed to meet in the backward direction of their propagation. 
    \bulletAs the imaginary light rays meet and form the image, therefore the image can not be caught on a screen.
    Hence, option (A) is the correct answer.\textbf{Hence, option (A) is the correct answer.}
  • Question 3
    1 / -0
    What does Newton's colour disc possess?
    Solution
    Newton's colour disc, as the name suggests, was invented by Sir Issac Newton and is a disc with seven segments in rainbow colours.VIBGYOR (Violet–Indigo–Blue–Green–Yellow–Orange–Red)

    Hence, the correct answer is OPTION A. 
  • Question 4
    1 / -0
    An ideal mirror:
  • Question 5
    1 / -0
    What will be the condition of image when you stand in front of a plane flat mirror and look at yourself and you raise your right hand?
    Solution
    The image formed will be an erect image of same height as that of the person (object) but laterally reversed  i.e. his right hand will appear to be his left hand of his mirror image and vice-versa.

    Thus option C is correct.
  • Question 6
    1 / -0
    When the distance between the object and the plane mirror increases.
    Solution
    Since image formed by a plane mirror is at a same distance as that of object distance increases then image distance will also increase.
  • Question 7
    1 / -0
    The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ___________.
    Solution
    Reflection is the phenomenon by which the incident light falling on a surface is sent back into the same medium.
  • Question 8
    1 / -0
    Complete the following statement. A plane mirror will produce a virtual image:
    Solution
    An image is said to be virtual, if the rays coming from the object do not actually intersect, but appear to meet at a point. 

    For any object placed in front of a plane mirror, all images are formed behind the mirror. Hence a plane mirror produces a virtual image at all distances from the mirror.
  • Question 9
    1 / -0
    In above figure, a candle is placed in front of the plane mirror. Points A, B, C, D and E are marked as shown in the figure. Find out the possible point where image is formed.

    Solution
    Plane mirror always form a virtual erect image of same height as that of object and at the same horizontal level where the object is place.
    According to the figure, point C is on the same level with the candle. Thus image is formed at point C.
  • Question 10
    1 / -0
    Which of the following forms a virtual and erect image of same size for all positions of the object?
    Solution
    Plane mirror and convex mirror will always form virtual and erect images for all position. Convex mirror forms diminished image.
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