State the conditions for the shadows to be formed.
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An opaque object blocks the light falling on it. This creates an area of darkness on the side of the object away from the source of light. A translucent object also creates a faint area of darkness. An area of darkness formed by an opaque object obstructing light is called a shadow. 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.
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a shadow is formed when there is an obstruction or blockage in the rectilinear path of light . Then the object 's outer structure image is formed. This image is called shadow.
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