why light is always along straight line
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In a dusty atmosphere it is sometimes possible to see lighttravelling and it does appear to be moving in a straight line. The fact that light travels can be demonstrated by putting an object in its path. ... As lightdoes appear to travel in straight lines then light is usually modelled as straight lines in drawings.
Shadows can provide evidence that light travels in straight line. Think of the shadows that are formed on a cloudless sunny day, they are very well defined shadows. Supposing at this point that light did not travel in straight lines what would the shadows look like? They would probably be very fuzzy just like you would get on a sunny day with lots of clouds in the sky. When the sky is cloudy the sunlight is reflected of the clouds and they become secondary sources of light so on such a day the shadow is formed from lots of different light sources coming from a variety of directions.
Shadows can provide evidence that light travels in straight line. Think of the shadows that are formed on a cloudless sunny day, they are very well defined shadows. Supposing at this point that light did not travel in straight lines what would the shadows look like? They would probably be very fuzzy just like you would get on a sunny day with lots of clouds in the sky. When the sky is cloudy the sunlight is reflected of the clouds and they become secondary sources of light so on such a day the shadow is formed from lots of different light sources coming from a variety of directions.
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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
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