A) \[{{90}^{o}}\]change of phase in one of the reflected waves
B) \[{{180}^{o}}\]change of phase in one of the reflected waves
C) \[{{145}^{o}}\]change of phase in one of the reflected waves
D) \[{{45}^{o}}\]change of phase in one the reflected waves
Correct Answer: B
Solution :
The rings observed in reflected light are exactly complementary to those seen in transmitted light. Corresponding to every dark ring in reflected light there is a bright ring in transmitted light. The ray reflected at the upper surface of the air-film suffers no phase change while the ray reflected internally at the lower surface suffers a phase change of\[\pi \]
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