A) zero
B) \[\frac{\pi }{2}\]
C) \[\pi \]
D) 2\[\pi \]
Correct Answer: C
Solution :
When light is reflected off a more dense medium with higher refractive index of refraction, crests get reflected as troughs and troughs get reflected as crests. The wave is said undergo a\[180{}^\circ\] change of phase on reflection. The net effect of the phase change is that the reflected ray jumps ahead by half a wavelength.
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