When light in medium 1 is reflected from the surface of medium 2 with the indices of refraction of the media being n1 and n2 respectively, the reflected light has a phase difference of 180° if
A)
n1 > 3 n2.
B)
n1 = n2.
C)
n1 < n2.
D)
n1 > n2.
E)
n1 > 2 n2.
C
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