When a Central Dark Fringe Is Observed in Reflection in a Circular

question 22

Multiple Choice

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) π/2.
• C) π.
• D) 3π/2.
• E) 2π.

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Definitions:

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