Three Materials with N₁ < N₂ < N₃ Are Arranged

question 30

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 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.