You Place a Convex Lens on Top of a Flat

question 67

Multiple Choice

You place a convex lens on top of a flat plate of glass and illuminate it with monochromatic light of wavelength 600 nm.You observe a dark circle at the center of the lens,surrounded by a series of concentric dark rings.What is the thickness of the air space between the lens and the flat glass plate where you see the sixth dark ring?

• A)3.90 µm
• B)3.60 µm
• C)1.80 µm
• D)1.95 µm
• E)2.10 µm

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