Why is light affected by gravity if it has no mass?
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Gravity doesn’t bend light. Light will ALWAYS travel in a straight line.
The thing that happens is that the presence of mass bends the space-time itself. While it may appear that light bends in this situation, it does not. It moves straight in a curved medium which gives the illusion of light bending.
A way to look at it is imagine you and a friend are 1000 miles appart on the equator and you both start walking exactly north so you are walking in parallel lines. Despite your parallel paths, your paths will intersect at the pole. This isn’t because you bent your path because you did walk in a straight line the entire time. The problem is that the surface you were waking on itself was bent.
In bent mediums, straight lines appear curved.
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