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What happens to the amount of incident light reflected if the angle of incidence is increased?

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What happens to the amount of incident light reflected if the angle of incidence is increased?

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  1. Generally it increases. See the ref. For light passing from a denser to a less-dense medium (N1>N2), reflection is at a minimum value (4% for glass-air) at 0 deg incidence and increases up to a critical angle above which total internal reflection occurs. For N1<N2, reflection is a function of E-field polarization. With out-of-plane polarization, reflection Rs continuously increases with increasing angle of incidence. With in-plane polarization, reflection Rp decreases until it reaches 0 at Brewster's angle, then increases. For glass with N2=1.5, total reflection of unpolarized light (=(Rp+Rs)/2) increases almost continuously (but with some variation around Brewster's angle) from 4% at 0 deg to 100% at 90 deg..

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