Ex.
A wedge-shaped film of air is produced by placing a fine wire of diameter D between the ends of two
flat glass plates of length L = 20 cm, as in fig. When the air film is illuminated with light of wavelength
a = 550 nm, there are 12 dark fringes per centimeter. Find D.
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Answer:
a 550 nm, there are 12 dark fingers
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