Three Materials with N₁ < N₂ < N₃ Are Arranged $\theta$

question 97

Multiple Choice

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 40° and the ray eventually exits the third layer at the refracted angle $\theta$ in air. What is the value of $\theta$ ?

• A) Some angle more than 40°.
• B) Insufficient information to answer.
• C) 40°.
• D) Some angle less than 40°.