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

Question

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The Answer of 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

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