The conditions for producing sustained interference are I. phase di...

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The conditions for producing sustained interference are
I. phase difference between interfering waves remains constant with time.
II. interfering waves have nearly same amplitude levels.
III. interfering waves are of same frequency.
IV. interfering waves are moving in opposite directions.
(a) I, II and III
(b) II and III
(c) III and IV
(d) I and IV
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