Practice question

**Snell's law** n₁ sinθ₁ = n₂ sinθ₂ describes refraction at plane interface, n refractive index, θ angle with normal. When light goes from denser n=1.52 glass to rarer air n=1, sinθ₂ = (n₁/n₂) sinθ₁ > sinθ₁, bending away from normal, enabling total internal reflection beyond critical angle. A convex mirror always produces a virtual, erect, and diminished image, regardless of the object’s position. This provides a wide field of view, allowing drivers to see a larger area behind the vehicle, making it ideal for rear-view mirrors despite the reduced image size. Substituting values gives Provides a wide field of view with a diminished image, which