Three Flat Layers of Transparent Material Are Stacked Upon One

question 82

Multiple Choice

Three flat layers of transparent material are stacked upon one another.The top layer has index of refraction n₁,the middle n₂ and the bottom one n₃.If n₁ > n₂ > n₃,and a ray of light in air strikes the top layer,at which surface given can total internal reflection occur first?

• A)the top surface
• B)the surface between materials with indices n₁ and n₂
• C)the surface between materials with indices n₂ and n₃
• D)Total internal reflection cannot occur at any of these surfaces.

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