What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.52)is 17°?
A) 11°.
B) 17°
C) 26°
D) 26°.
E) 11°

Question

What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.52)is 17°?
A) 11°.
B) 17°
C) 26°
D) 26°.
E) ​11°

Quizplus · Accepted Answer

The angle of incidence (θ_1) and the angle of refraction (θ_2) are related by Snell's Law: n_1 sin(θ_1) = n_2 sin(θ_2), where n_1 is the refractive index of the first medium (air, usually assumed to be 1), n_2 is the refractive index of the second medium (glass, n = 1.52 in this case).

Rearranging the equation, we get sin(θ_1) = (n_2/n_1) sin(θ_2) = (1.52/1) sin(17°) = 0.423. Taking the inverse sine (sin⁻¹) of both sides, we get θ_1 = 25.8° or approximately 26°. Therefore, the correct answer is C.

What Is the Angle of Incidence on an Air-To-Glass Boundary