Colors of Light Notes Vocabulary: White Light- is not a single color. It is made of a mixture of the 7 colors of the rainbow Wavelength- light travels in waves, different colors have different wavelengths- how long or short they are Prism- a tool that uses refraction to spread out the different wavelengths that make up white light Refract- the bending of light Reflect- to bounce off Absorb- to take in Primary Colors of Light- Red, Blue, Green LIGHT The major source of light on earth is the sun. Other sources are fire, light bulb (flashlight & lamp), light filtered with other colors (ex: red light bulb, red lamp shade, red tinted glasses) COLOR The sun gives off white light. White light is a combination of the 7 colors of the rainbow: ROYGBIV Other types of lenses that refract light: eyeglasses, sunglasses, telescopes, microscopes A prism can be used to refract (bend or split) the white light into the 7 colors. What We See • The color an object appears depends on the color the object reflects. Example: a red book ONLY reflects red light, so we see the book as being RED • White objects reflect ALL colors of light because when they are all mixed they make up all colors. • Black objects absorb all colors of light because we don’t see any color. Red notebook We see the color of something because that color is reflected (bounced) into our eyes. All the other colors of white light are absorbed (taken in) into the object so we don’t see those colors. More about Lenses • • • • • • • • • A lens is a curved piece of glass or plastic designed to refract light in a specific way. Lenses are used in glasses and contacts to help correct vision. They are used in telescopes to help view items that are far away. They are used in microscopes to help view very small items. Another way to classify lenses is by the curve of the glass on each side of the lens. There are terms used to describe each side. Then the two sides are combined to come up with the name of the lens. Convex - A convex lens is one where the center of the lens is thicker than the edges. Concave - A concave lens is one where the center of the lens is thinner than the edges. One way to remember the difference between the two lenses is to think of "caving in" with the concave lens Refraction • • • When a light wave moves from one medium (like air) to another medium (like glass) the light rays are bent. This is called refraction. By using refraction, lenses can bend multiple light rays. Most of the lenses we use in everyday life are designed to bend light rays to a specific focal point where items will be in focus (clear).