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DSQ 1. What is light? 2. What are the 3 main materials used to describe an object? 3. Why does the door appear brown and not any other color? WORKSHEET WHAT DETERMINES COLOR? When light strikes an object, the light can be reflected, absorbed or transmitted CLASSIFYING MATERIALS 3 main materials that can be used to describe an object is 1. Transparent 2. Translucent 3. Opaque TRANSPARENT A material that transmits most of the light that strikes it is called transparent Light passes through and allows you to see clearly what is on the other side Water, air and glass are all transparent TRANSLUCENT Materials scatters the light that passed through it You can usually see something behind a translucent material but the details are blurred Wax paper and frosted glass are examples of translucent materials TRANSPARENT & TRANSLUCENT OBJECTS Ex. When white light shines through a transparent blue glass, the glass appears blue because it transmits blue light Transparent and translucent materials are used to make color filters. Ex. Sunglasses OPAQUE A material that reflects or absorbs all of the light that strikes it You CANNOT see through opaque materials because light cannot pass through it Wood, metal and snow are examples OPAQUE OBJECTS Every opaque object absorbs some wavelengths of light and reflects others The color of an opaque object is the color of the light it reflects Ex. A banana appears yellow because it reflects yellow wavelengths of light and absorbs the other colors HOW DO COLORS COMBINE? Primary colors: 3 colors that can combine to make any other color. (Red, Yellow, & Blue) Secondary Color: 2 primary colors combine in equal amounts When the 3 primary colors of light are combined in equal amounts, they produce white light A primary and a secondary color can combine to make white light. Any 2 colors that combine to form white light is called complementary colors. MIXING PIGMENTS Inks, paints and dyes are called pigments, which are used to color other materials Pigments absorb or reflect colors When mixing pigments, fewer colors of light are reflected and more are absorbed When the 3 primary colors of pigments are combined in equal amounts, they produce black HOOK ACTIVITY DSQ Light and sound are both forms of energy and are transmitted in a similar way. How is light transmitted? How do you know when one wave has more energy than another wave? What does it mean if the waves are closer together? When you turn on a light in a dark room, can you see the light traveling? LIGHT LASER MAZE REFLECTION 2 ways which a surface can reflect: 1.Regular Reflection 2.Diffuse Reflection REGULAR REFLECTION Occurs when parallel rays of light hit a smooth surface All light reflect at same angle DIFFUSE REFLECTION Occurs when parallel rays of light hit an uneven surface Each ray hits the surface at different angles because the surface is uneven You either don’t see an image or the image is not clear REFRACTION AND LENSES Refraction: When light rays enter a new medium at an angle, the change in speed causes the rays to bend AIR, WATER AND GLASS When light passes from air into water, the light slows down Light slows down again and bends even more when it passes from water into glass When light passes from glass back into air, the light speeds up Light travels fastest in air, then water then glass Glass causes light to bend more than air or water Another way to say it is that glass has a higher index of refraction than either air or water THE INDEX OF REFRACTION The index of refraction of a medium is a measure of how much a light ray bends when it enters that medium The higher the index of refraction, the more it bends light RAINBOWS When white light from the sun shines through the droplets, a rainbow may appear The water droplets act like tiny prisms, refracting and reflecting the light and separating the colors MIRAGE A mirage is an image of a distant object caused by refraction of light It looks like the road is wet, however, when you get closer, the road is dry. Why? The air just above the road is hotter than the air higher up. Light travels faster in hot air, so the light rays from the car that travel toward the road are bent upward by the hot air. Your brain assumes that these rays traveled in a straight line so the rays look reflected off a smooth surface