I am about to start learning about light, having some knowledge of electromagnetic waves. I know an accelerated charge produces changing electric field which produces a changing magnetic field and vice versa thus EM waves propagate in space. Now I have doubt when we start speaking of light as a wave we draw the common sine wave to represent the same.But what does that waving thing actually represent in physical sense? What is actually oscillating that we represent in light wave?![edit:Have a look at image.In the image you can see light waves represented as something like sine curve.I wanted to ask if light is an electromagnetic wave it should have two field oscillating-one electric and other magnetic, but as shown in image which is commonly found in books explaining interference etc. why we have only a single curve and what is that]?(https://i.sstatic.net/uRTNb.jpg)
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