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Light Shadows and Reflections Test - 12

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Light Shadows and Reflections Test - 12
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  • Question 1
    1 / -0
    Water is
    Solution
    Transparent objects are those objects that allow large quantities of light to pass through them. 
    Air, water and shiny glass are all examples of transparent materials.
    Water allows light to pass through it, therefore it is transparent.
  • Question 2
    1 / -0
    Which of the following is transparent?
    Solution
    A transparent object is one which allows all light to pass through it.
    Since glass allows all the light to pass through it, so it is a transparent object.
    Stone, wood and plastic are opaque materials.
  • Question 3
    1 / -0
    Shadow moves with
    Solution
    A shadow is cast on the side of the object that is furthest from the light source. The proximity of the object creating the shadow to the light source determines the relative size of the shadow. As an object moves further from a light source, the shadow becomes smaller, and as an object moves closer, the shadow becomes larger. The angle of the light source determines the length of the shadow.
    that's why all options are correct.
  • Question 4
    1 / -0
    The length of the shadow will be longest when the
    Solution
    According to the law of reflection; the angle of incidence is equal to the angle of reflection. Therefore the angle of reflection would be $$90^o$$ when the angle of incidence is $$90^o$$. This will happen when the source of light is perpendicular to the object. Hence the longest image will be formed when the source of light and the object are perpendicular to each other. 
  • Question 5
    1 / -0
    Which of the following is a translucent?
    Solution
    As ground glass allows light partially to pass through it, therefore it is a translucent object whereas wood, stone and plastic are opaque materials.
  • Question 6
    1 / -0
    Substances that allow light to pass through them are called
    Solution
    Transparent objects are those objects that allow large quantities of light to pass through them. 
    Air, water and shiny glass are all examples of transparent materials.
  • Question 7
    1 / -0
    Shadow of an object falls in
    Solution
    A shadow is a region where light from a light source is obstructed by an opaque object. It occupies all of the three-dimensional volume behind an object with light in front of it. Shadow of an object falls in the direction opposite to that of source of light.
  • Question 8
    1 / -0
    Substances that do not allow light to pass through them are called
    Solution
    An opaque object is neither a transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). Opaque object does not allow light to pass through it.
    For example, stone and wood are opaque materials.
  • Question 9
    1 / -0
    Which of the following is an opaque object?
    Solution
    An opaque object is one which does not allow light to pass through it.
    A transparent object is one which allows  light to pass through it. 
    Wood being an opaque object, does not allow light to pass through it.
    All other objects (glass,air and vaccum) allow light to pass through it.Because these three are transparent.
  • Question 10
    1 / -0
    Formation of shadows can be explained by :
    Solution
    Rectilinear propagation is a property of light to travel along a straight line. When an object falls on its path, the straight path of the light is obstructed, and a shadow is formed.

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