A beam of light is reflected from a thin film made of two layers of different ma

Question

A beam of light is reflected from a thin film made of two layers of different materials. The figure shows what happens to three of the incident rays. The light is initially traveling in air. When ray A is reflected from the top layer, will there be a phase change? Explain your reasoning. When ray B is reflected from the top of the second layer, will there be a phase change? Explain your reasoning. When ray C is reflected from the bottom of the second layer, will there be a phase change? Explain your reasoning.

Explanation / Answer

for A ,there will be phase change of 180 degree

reason-when ways reflects from the medium of higher relractive index ,it experience the phase change of 180 degree

for B and C there will be no phase change because when waves travel from higher to smaller refractive index medium ,there is no phase change

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