Three materials with n₁

Question

Three materials with n₁ < n₂ < n₃ are arranged in layers of uniform thickness.A light ray in air enters the first layer at an angle of incidence of 30° and the ray eventually exits the third layer at the refracted angle θ in air.What is the value of θ? A)Some angle less than 30°. B)30°. C)Some angle more than 30°. D)Insufficient information to answer.

Quizplus · Accepted Answer

According to Snell's Law, the angle of incidence and the angle of refraction are related by the indices of refraction of the two media. When light returns to the same medium it started in (air, in this case), the exit angle will equal the entrance angle if the layers are parallel, regardless of the indices of refraction of the intermediate layers. Thus, θ = 30°.

Three Materials with N1 < N2 < N3 Are Arranged

Three Materials with N₁ < N₂ < N₃ Are Arranged