Eli5 Why light waves require line of sight while sound waves do not?
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They don’t really. Think of someone in the next room turning on a light and you’re around a corner. Those light waves are reflecting off of walls and other surfaces and you see them. If you look outside your window during the day, you see what is outside. That is reflected sunlight. You don’t need direct line of sight because light will reflect off of objects. That is literally how you see.
Sound does the same thing. You’ll hear it best directly from the source, but you’ll still hear it as sound waves bounce off of the environment.
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