Which of the following statement (s) is/are true about interference...

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Which of the following statement (s) is/are true about interference pattern due to double slits?
I. The interference pattern has equal number of bright and dark band width .
II. The pattern is obtained by superposition of two waves originating from the two narrow slits.
III. We get a minima at an angle of \( \lambda / a \) where ' \( a \) ' is the distance between two slits
(a) I only
(b) II only
(c) I and II only
(d) I, II and III
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