Three Flat Layers of Transparent Material Are Stacked Upon One

question 60

Multiple Choice

Three flat layers of transparent material are stacked upon one another.The top layer has index of refraction n₁,the middle has n₂ and the bottom one has n₃.If n₁ < n₂ < n₃,at what angle of incidence will a ray of light traverse the three layers in a single straight line?

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