By Allan B. Cobb
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Additional info for Super science projects about light and optics
At each end of the color spectrum are other wavelengths that we cannot see. Even though we cannot see these other wavelengths, we can feel their effects. Infrared and ultraviolet are wavelengths on either side of the visible spectrum. Infrared light is felt as warmth, whereas ultraviolet light causes sunburns. As you have seen, light is refracted as it Page 19 passes through different substances. The amount that light is refracted depends on its wavelength. Because each wavelength of light travels through a substance at a different speed, it is possible to separate white light into all of its component colors.
Page 34 #5 Lay the yardstick or meterstick on a flat surface in a darkened room. Place the flashlight and magnifying glass on pieces of modeling clay for supports. Fold the sheet of white paper in three so that it can stand up without support. #6 Set the distance between the flashlight and the magnifying glass at exactly 8 inches (or 20 cm). Adjust the position of the screen until the image is sharp. Record the image distance in a data table. Use a ruler to measure the height of the image on the screen.
High-powered lasers deliver incredible amounts of energy in the beam and it can be used to vaporize the hardest and most heat-resistant materials. In this experiment, you will explore a low-powered coherent light source and an incoherent light source. IMPORTANT Even though the laser used in this activity is low powered, care should be taken when using it. Do not shine the laser in your eyes or in anyone else's eyes. Page 27 What You Need · A small flashlight · A laser pointer · A ruler · A tape measure, yardstick, or meterstick What You'll Do #1 In a darkened room, shine the flashlight on the wall from 3 feet (1 m) away.
Super science projects about light and optics by Allan B. Cobb