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Light Shadows and Reflections Test - 9

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Light Shadows and Reflections Test - 9
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  • Question 1
    1 / -0
    Select the odd one out (shadows, eclipses, expansion, images)
    Solution
    Expansion is a property related to heat or force and not light while others are the properties  related to light.
  • Question 2
    1 / -0
    ________ materials do not allow any light to pass through.
    Solution
    According to definition, opaque objects do not allow light to pass through. Examples are coal, wood etc.
  • Question 3
    1 / -0
    The bouncing of a beam of light from a polished surface in some other direction is called -
    Solution
    $$ \bf{Refraction} $$ of light is the phenomenon of bending of light or change in the direction of light, when it passes obliquely from one transparent medium to another.

    $$ \bf{Reflection} $$ is the phenomenon in which light rays on striking a polished surface(such as a mirror) bounce back or are sent back into the same medium. 

    $$\bf{Dispersion} $$ is the phenomenon of splitting of white light into its component colours (VIBGYOR) on passing through a glass prism.

    $$\bf{Scattering} $$ is the phenomenon by which a beam of light is redirected or deflected in many different directions, when it passes through an imperfect medium, due to interaction with the particles of the medium.

    Hence, the correct answer is OPTION B. 
  • Question 4
    1 / -0
    Pinhole camera is a simple application of :
    Solution
    A pin hole camera works on the principle of rectilinear propagation of light. It demonstrates how light forms images of objects.
  • Question 5
    1 / -0
    Wax is an example of:
    Solution
    Light can partially pass through wax. So it is said to be a translucent object.
  • Question 6
    1 / -0
    When light is reflected from the a spherical or curved surface: 
    Solution
    The laws of reflection hold good irrespective of shape of the reflecting surface. So, the laws hold good for spherical or curved surfaces too.
  • 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
    Translucent materials allow ______ amount of light to pass through.
    Solution
    According to definition, translucent objects allow some amount of light to pass through it. Examples are butter paper, ground glass etc.
  • Question 9
    1 / -0
    An ideal mirror:
  • Question 10
    1 / -0
    Which of the following is not an example of natural pinhole camera ?
    Solution
    D) Soap bubble in air is not an example of natural pin hole camera.
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