Question

A flashlight beam strikes the surface of a pane of glass (n = 1.56) at a 57 angle to the normal. Part A What is the angle of refraction? Express your answer using two significant figures. 1190 Add o al ? Submit Request Answer

Answer 1

Using the Law of refraction, we know

n₁ Sin θ₁ = n₂ Sin θ₂

where, n₁ = refrative index of air = 1

n₂ = refrative index of glass = 1.56

θ₁ = angle made by incident light to the normal before refraction.

θ₂ = angle made by incident light to the normal after refraction.

Now putting the values:

1 * Sin (57^o) = 1.56 * Sin θ₂

0.4362 = 1.56 * Sin θ₂

Sin θ₂ = 0.4362 /1.56 =0.2796

θ₂ = Sin⁻¹ 0.2796

= 16.24^o

As we have to report the answer in 2 significant figures, so, 16^o will be the answer.

hope this helps!