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In order to observe good interference and diffraction pattern, the necessary and sufficient conditions are
I. the distance between the slits should be very small \( (\sim \mathrm{mm}) \)
II. the slit width should be very small \( (\sim \mathrm{mm}) \)
III. the distance between the slits and the screen should be large \( (\sim \mathrm{cm}) \)
IV. the distance between slits and the screen should be small \( (\sim \mathrm{mm}) \)
(a) I and II
(b) I and III
(c) I, II and III
(d) II and III
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