![]() ![]() A dotted line is drawn from the point where the red line enters the glass to a point beneath the section of the red line that is inside the glass. The section of line inside the glass is bent. A red line is traveling through the glass. TIM: The amount the wave bends is known as the angle of refraction.Īn image shows a piece of glass in the shape of a triangle. In the water, text reads: water (more dense). The underwater object looks a little distorted and funny.Ībove the water, text reads: air (less dense). TIM: This slowing causes a shift in the light’s direction. The portion of line in the bottom section of the screen is not aligned with the portion in the top section of the screen and moves at a fraction of the speed. A wavy line is traveling through the top of the screen into the bottom of the screen. In the bottom section of the screen, text reads: water (more dense). In the top section of the screen, text reads: air (less dense). TIM: Water is denser than air, so when light goes from air to water, it slows down.Īn animation shows the screen split in half. The portion of arm that is under water is not aligned with the portion above the water. TIM: If you look at something in a pool of water, you can see refraction at work.Īn animation shows an arm being submerged in water. TIM: Well, it happens because light changes speed when it travels between materials of different densities. When they reach the other side of the glass, the path returns to its original path of travel. The line segments travel into a large piece of glass and their path of travel bends. TIM: But if it goes into a new material - like from air to water or glass - it bends. TIM: Normally light goes straight, minding its own business unless something gets in the way.Īn animation shows a group of bent line segments traveling diagonally across the screen. On screen text reads: “particle” and “photons.” On screen text reads: “wave” and “light.” A dotted line is traveling across the right side of the screen. A wavy line is traveling across the left side of the screen. TIM: Light is a form of energy that zooms around as both waves and particles, or photons.Īn animation shows the screen split in half. On screen text reads: “refraction,” “diffraction,” and “waves.”Īn animation shows a light bulb emitting light. A wavy line is shown traveling across the bottom of the screen. Refraction and diffraction are both important properties of waves.Īn animation shows a group of bent horizontal line segments traveling across the top of the screen. TIM: Dear Tim & Moby, I don't understand the difference between refraction and diffraction. Tim reads from a typed letter with water. A robot, Moby, is standing near the pool.Īn animation shows Tim looking up through the surface of the water at Moby, who is holding a letter.Īn animation shows Moby hold up the letter. Text reads: The Mysteries of Life with Tim and MobyĪ man, Tim, is swimming in a pool. ![]()
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