You can see objects because light from that object travels to your eyes. Sometimes light is reflected off objects before it reaches our eyes, and sometimes it comes straight from the source itself.

A candle is a light source. So is a campfire, a light bulb, and the sun. An apple, however, reflects light. It doesn't give off any light on its own but you can see it because light waves bounce off the apple into your eye. If you shut off the light, then you can’t see the apple. In this same way, the sun is a light source, and the moon is a light reflector.

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You see objects because light reflections because light reflects off them into your eye. The angle that the light wave approaches it equal to the angle that the wave leaves the surface, which is not only true for light but also sound waves.

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