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Posted: **Mon Jul 18, 2022 5:45 am**

: When A Central Dark Fringe Is Observed In Reflection In A Circular Interference Pattern Waves Reflected From The Upper 1 (122.72 KiB) Viewed 34 times

When a central dark fringe is observed in reflection in a circular interference pattern, waves reflected from the upper and lower surfaces of the medium must have a phase difference, in radians, of a. 0. b. 02. c. 7. d. 372. e. 2. ANS: C