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11. A fiber is placed between two flat glass plates at their ends. When the plates...

11. A fiber is placed between two flat glass plates at their ends. When the plates of
length 14.0 cm, are illuminated from above with light of λ = 650 nm, bright
interference bands separated by 0.580 mm. What is the diameter of the fiber? answer (78.4 um)

please draw and explain

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