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how come light is a wave and how do you visualize it?Why waves are thought to be like sine or cosine function?Also my most important question what is the basic difference between interference and diffraction?

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    $\begingroup$ Hi user and welcome to Physics.SE. Please don't ask all questions at once. And, your question(s) seem to be a bit broad. While we accept conceptual physics questions, we don't teach a whole topic to someone. If that's what you need, you should take an introductory course. Just a suggestion, there are a lot of things in math, that one can't visualize ;-) $\endgroup$ – Waffle's Crazy Peanut Aug 22 '13 at 17:17
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    $\begingroup$ @CrazyBuddy: The laast part, it isn't exactly relevant to this question. $\endgroup$ – Abhimanyu Pallavi Sudhir Aug 23 '13 at 18:18
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The most counter-intuitive aspect of the quantum world is the fact that quantum objects can behave both as waves and as particles which is called the wave-particle duality. Since Light is a quantum object, so it can be a wave or a particle.

Although visualization is important in understanding concepts its not always possible.Like for eg we are stuck in this 3D space that live in so we cannot imagine how higher dimensions would look like but there are concepts in mathematics which can deal with such situations.So the effort should be in trying to understand the mathematics that describe the physics instead of visualizing it.

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