Question #166fd
1 Answer
Size of shadow formed on a screen depends on
-
the size of light source
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the size of opaque object for which shadow is being formed.
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the distance of the screen from the opaque object
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the distance of the object from the source.
The formation of shadow in different situations is shown in the following figures.
Fig-I
Fig-II
Fig-III
Our problem is to decide about the change in size of a shadow when the object moves from the source of light towards the screen.
From Fig-I and Fig-II(where the size of the light source is smaller than the opaque object)
It is obvious that the size of the shadow becomes minimum when the distance of the object from the screen is nil (minimum).
From Fig-III (where the size of the light source is bigger than the opaque object)
We see that the size of the shadow increases as the object moves towards screen and reaches maximum when the distance between the object and screen becomes nil
