Snell's Law Practice Problems for AP Physics 2 with Solutions

📚 Topic Summary

Snell's Law describes the relationship between the angles of incidence and refraction when light passes through a boundary between two different isotropic media, such as water and air. It's a fundamental principle in optics and is crucial for understanding phenomena like lenses, prisms, and even the shimmering you see on a hot road. The law states that the ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of phase velocities, or equivalently, to the reciprocal of the ratio of the indices of refraction.

In simpler terms, when light moves from one medium to another, it bends. How much it bends depends on the properties of the two materials, specifically their refractive indices. Snell's Law gives us a way to predict exactly how much bending will occur, and it's essential for AP Physics 2!

🧪 Part A: Vocabulary

Match each term with its definition:

1. Angle of Incidence
2. Angle of Refraction
3. Index of Refraction
4. Snell's Law
5. Normal

1. The bending of light as it passes from one medium to another.
2. A line perpendicular to the surface at the point of incidence.
3. The angle between the refracted ray and the normal.
4. $n_1 \sin(\theta_1) = n_2 \sin(\theta_2)$
5. The angle between the incident ray and the normal.

✍️ Part B: Fill in the Blanks

Snell's Law states that when light passes from one medium to another, it ________. The amount of bending depends on the ________ of refraction of the two media. The angle of ________ is the angle between the incident ray and the normal, while the angle of ________ is the angle between the refracted ray and the normal.

🤔 Part C: Critical Thinking

Explain how Snell's Law is applied in everyday life, providing at least two specific examples.