What is rectilinear propagation of light? Explain the three things essential for the formation of a shadow.
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Rectilinear propagation' is a wave property which states that waves propogate (move or spread out) in straight lines. Hence if an object falls in its path, they are bound to reflect and form a shadow and not take a curved
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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