Two Optically Flat Plates Lie One on Top of the Other.A

question 39

Multiple Choice

Two optically flat plates lie one on top of the other.A sheet of paper 0.1 mm thick is inserted between the plates at one edge.When the plates are illuminated by light of wavelength 589 nm,the number of interference fringes observed by reflected light is approximately

• A)470
• B)340
• C)294
• D)170
• E)123

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