1.) Explain-Light travels in straight lines
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Answer: In a dusty atmosphere it is sometimes possible to see light travelling 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 light does appear to travel in straight lines then light is usually modelled as straight lines in drawings.
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Light travels in straight lines primarily due to the fact that light is a wave. However, light can change its path (away from a straight line) when it is incident on certain obstacles. This effect is commonly reffered to as diffraction.
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