Light travels in straight lines but can round corners in optical fibre.
Explain how you can see around corners but still have the light travelling in straight lines.
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Explanation:
This diffraction causes a beam of light to slowly spread out as it travels, so that some of the light bends away from the straight line motion of the main part of the wave. ... This turning away of some of the light from the forward direction is a form of "bending around corners" even when a corner may not exist.
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