What Is Light Refraction?

Are you looking for an easy way to teach your child about light refraction? We’ve put together a set of free materials that parents and teachers can use right away. In this lesson, your child will dive into the fascinating world of optics.

We’ll explore how light bends and changes direction when traveling through different materials. Explore science in a more engaging way with captivating 3D videos and interactive quizzes. Download our app to get started!

What You Will Learn From This Lesson

What is light refraction?

Refraction is a phenomenon that happens when light travels from one medium to another, such as from air into water or glass. When this move occurs, the light changes direction and bends.

However, if light enters another medium perfectly straight, refraction does not occur. This bending of light is the reason why objects underwater can appear to be in a different position than they actually are.

The direction of the bend depends on which materials the light is passing through. When light passes from air into water or glass, it bends away from the surface.

Conversely, when light moves from water or glass back into the air, it bends toward the surface. This constant bending helps create interesting visual effects in nature, such as mirages, where distant objects appear to be floating in the sky.

How does light split into different colors?

Refraction also explains how we see rainbows and other colorful displays through a process called dispersion. Sunlight is polychromatic, meaning it is made of many different colors.

When this light passes through a medium like water droplets or a prism, it is split into individual monochromatic colors: red, orange, yellow, green, blue, indigo, and violet.

Different colors of light bend at different angles during this process.

For example, violet light bends the most, while red light bends the least. This specific order is why red is always found at the top of a rainbow and violet is at the bottom. We see the beauty of dispersion in many places:

• Rainbows: Sunlight splits into colors as it passes through rain droplets in the air.
• Diamonds: The multicolored sparkle of a diamond is caused by light dispersing as it travels through the stone.
• Beetles: Some beetles have colorful shells because sunlight is split through refraction as it hits them.
• Halos: A bright ring or halo around the sun is another result of light undergoing dispersion in the atmosphere.

Fun Fact

• Light bends when it moves from air to water, which can make things look “broken.”
• Rainbows always have the same color order because each color bends at a different angle.
• Light “trips” and slows down when it enters the glass, causing it to bend into a beautiful spectrum.
• Every raindrop in the sky acts like a “nature prism” to create the rainbows we see after a storm.
• Your own eyes have “living magnifying glasses” inside them that help you focus on the words you are reading right now.

Vocabulary

• Refraction: The phenomenon where light changes direction and bends as it travels from one medium to another, such as from air into water or glass.
• Medium: A material that light travels through, such as air, water, glass, or a diamond.
• Dispersion: The process where polychromatic sunlight passes through a medium like a prism or water droplet and splits into individual colors.
• Polychromatic: A term used to describe light, like sunlight, that is made of many different colors mixed together.
• Monochromatic: A term for a single color of light that has been split from a spectrum, such as red, orange, or violet.
• Spectrum: The beautiful band of colors (red, orange, yellow, green, blue, indigo, and violet) created when light “trips” and slows down upon entering a new material.
• Mirage: A visual effect caused by the bending of light in nature, making distant objects appear to be floating in the sky.
• Nature Prism: A raindrop in the sky that acts as a tool to split sunlight and create the rainbows we see after a storm.