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Formation of shadows can be explained by

  • A.Rectilinear propagation of light
  • B.Reflection
  • C.Refraction
  • D.Total internal reflection

Answer: A

Shadows are explained by the rectilinear propagation of light.

Light travels in straight lines in a uniform medium, so an opaque body blocks the rays behind it and leaves a dark region of the same outline. The sharpness depends on the source: a point source gives a crisp umbra, an extended source a fuzzy penumbra as well.

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