give examples of rectilinear propagation of light

The propagation of light in straight line is called rectilinear propagation of light.
Examples:
1-Ray of light coming from sun
2-Let us perform an activity in which we have three cardboard papers or any transparent medium of the same type and label them A, B, and C. Now put at one side of ‘A’ a source of light like candle ,open a pinhole at the middle of all the cardboard papers in a straight line making sure the light rays can be view through all, you will notice that the candle flame will be visible through the pinholes in a straight line only. This shows light is propagated rectilinearly.

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the line which travels in straight line is called rectilinear propagation of light

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