Refraction of light

High School

Definition

The bending of light as it passes from one transparent medium into another of different density, caused by a change in the light's speed. Refraction explains how lenses focus light and why objects in water appear displaced.

Worked examples

A pencil standing in a glass of water appears bent at the water's surface.

Light bends as it moves from water (denser) into air (less dense), making the submerged part appear shifted.

A convex lens brings parallel light rays to a focus point.

The glass bends rays toward the center because light slows down and refracts when entering the denser lens material.

Common mistakes

Light bends because it bounces off the surface between two media → Light bends because its speed changes when crossing into a medium of different density Bouncing is reflection; refraction is bending due to a speed change as light enters the new material.
Refraction only happens when light enters water → Refraction occurs whenever light crosses any boundary between materials with different densities Glass, plastic, air, and other transparent materials all refract light when the density changes.
The object in water actually moves or bends → The object stays put; refraction bends the light rays reaching your eye, so the image appears displaced Refraction changes where the light appears to come from, creating an optical illusion of displacement.

Where you'll use it next

You'll apply refraction when studying lenses and optical instruments in physics, understanding fiber optics and vision correction, and exploring wave behavior in advanced science courses.

Found in 1 StudyPug lesson

Refraction of Light and Snell's Law: Unraveling the Mysteries of Light Bending

Physics 11

Dive into the fascinating world of light refraction and Snell's Law. Understand how light bends, calculate angles, and apply your knowledge to real-world scenarios. Perfect for aspiring physicists and curious minds!

11th Grade11th