What Wavelength Monochromatic Source in the Visible Region (390 to 710

question 41

Multiple Choice

What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) in air if the film is 70.0 nm thick?

• A) 558 nm
• B) 430 nm
• C) 450 nm
• D) 409 nm

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