Three Flat Layers of Transparent Material Are Stacked Upon One

question 9

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?

• A)θ_i ​= sin^-1(1/n​₁)
• B)θ_i ​= sin^-1(1/(n​₁+n₂+n₃)
• C)θ_i ​= tan^-1(1/(n​₁+n₂+n₃)
• D)There is such an angle,but it is not given.

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