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When are two identical waves said to int...

When are two identical waves said to interfere (a) constructively (b) destructively?

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(a) Two identical waves when interfere constructively. Result in maximum intensity (`I_("max"=4a^2` where 'a' is the amplitude )
(b) Two identical waves when interfere destructively, result in a zero or minimum intensity `(I_("max")=0).`
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