Question

why light passes in the straight line​

Answer 1

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Light travels in the straight line because it does not generally interact with the medium and wherever it interacts it does change its path like when it is entering a different medium with different permeability and permittivity(denser or rarer). This interaction and bending of light is called refraction.

Answer 2

Answer:

light travel in straight line because generally it does not deflect in it's path