What is rectilinear propagation of light? Give examples

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What is rectilinear propagation of light? Give examples.

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The property of light travelling in a straight line is called as the rectilinear propagation of light .
A light source can be seen only if there is a straight-line path between the source and our eyes.

Examples:

  1. Sunrays entering a dark room through a small opening appear to travel in a straight line.
  2. Light from torch, headlights of cars, etc. appears to travel in a straight line.
  3. Light from a projector travels in a straight line in the form of light rays towards the screen.
  4. Light emitted from a laser pointer appears to travel in a straight line.