Is the Amplitude Coefficient of Reflection Always 0 at 90 Degrees?

AI Thread Summary
The amplitude coefficient of reflection is zero at an angle of incidence of 90 degrees, as derived from Fresnel's equations. This occurs because the reflection coefficient for parallel polarization becomes zero when the angle of incidence equals the angle of refraction. The discussion also touches on Brewster's angle, which is relevant for understanding when reflection is minimized for specific polarization states. Clarification is sought on whether the original question pertains to Brewster's angle, indicating a potential misunderstanding. Overall, the consensus is that the amplitude coefficient of reflection can indeed be zero at 90 degrees.
alchemist7
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At what angle of incidence is amplitude coefficient of reflection parallel to the incidence plane 0?

my solution is that by Fresnell's equation, r//=tan(i-i`)/tan(i+i`)=0, i=i`,i=90.so for whatever surface,angle of incidence should be 90.

is it correct? different from the answer!
 
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