Shadows


 
 
Concept Explanation
 

Shadows

An area of darkness formed by an opaque object obstructing light is called a shadow. Whenever an opaque object comes in the path of beam of light a shadow is formed.

The following three things are required for a shadow to form:

  •    A source of light
  •    An opaque object
  •    A screen or surface behind the object
  • A shadow will not form if any of these is absent. This explains why we cannot see a shadow in the dark. It is only when light rays are obstructed by an opaque object that we get a shadow of the object.

    Characteristic of a shadow:

    A shadow has the following three characteristics:

  • It is always black, regardless of the colour of the object used to make the shadow.
  • It only shows the dark outline of an object and not the details of the object.
  • The size of a shadow varies depending on the distance between the object and the source of light, and the distance between the object and the screen.
  •  The shape and the size of the shadow also varies with the position of the source of light. For example, our shadow in sunlight changes in the length and direction during the day as the sun changes its position in the sky.
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    Sample Questions
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    Question : 1

    Which of the following are correct ?

    (a) An area of darkness formed by an opaque object obstructing light is called a shadow.

    (b) When an opaque object comes in the path of beam of light a shadow is formed.

    (c) The size of a shadow varies depending on the distance between the object and the source of light .

    Right Option : D
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    Explanation
    Question : 2

    The objects that cast shadow are ____________

    Right Option : C
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    Explanation
    Question : 3

    Sharp shadow is formed by ________________

    Right Option : A
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    Explanation
     
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