A glass lens is coated on one side with a transparent polymer film of refractive…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

A glass lens (n=1.70)(n=1.70) is coated on one side with a transparent polymer film of refractive index n=1.30n=1.30 and thickness 120 nm120\,\text{nm}. Light is incident normally from air. For which wavelength in air will the reflected intensity from the coated surface be minimized for the lowest-order destructive interference? (a) 480 nm480\,\text{nm} (b) 624 nm624\,\text{nm} (c) 811 nm811\,\text{nm} (d) 406 nm406\,\text{nm}

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