Physics · Electromagnetic Waves and Optics

A monochromatic plane wave is incident normally from a dielectric medium A onto another dielectric medium B. The indices of refraction satisfy nA < nB. One-fourth of the incident energy is reflected back into medium A. If E is the resultant electric field due to the superposition of the incident wave and the reflected wave, then the ratio of the two time-averages ⟨E2⟩min / ⟨E2⟩max is:

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