Light doesn't need a medium to propagate. But when visible, is it compulsory that we see it only when it is reflected or the source?

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Solution

We see objects because light reflects from the objects and reach our eyes. Hence it is always the reflected light that we see.

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We know that light can travel through a vacuum. But are we able to see light when it travels through a vacuum? If not then what is it that makes stars visible in space(which is a vacuum)?

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