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Two Thin Layers of Material with Different Indices of Refraction

Question 49

Multiple Choice

Two thin layers of material with different indices of refraction are coated on a glass plate.The outer first material has n1 = 1.240,the inner second material has n2 = 1.550,and the glass has nglass = 1.62.If light is incident from air on the first layer,what is the phase change for light that reflects from the glass?


A) 180°
B) 0°
C) 360°
D) 540°
E) ​720°

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