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Mirrors and Lenses Rays and the Paths of Light Waves • Mirrors and lenses change the path of light waves and affect the images that you see. • Electromagnetic waves (light) travel in a straight line in all directions away from its source. • Because light travels in a straight line you can use a ray to show its path. Rays are especially useful to show the path of light after reflection, refraction, or diffraction. Mirrors and Reflection of Light • The shape of a mirror affects the way light reflects from it. • Mirrors are classified by their shape. – Plane-has a flat surface, image is right side up and about the same size, image is reversed from left to right. – Concave-curves inward, image may be right side up or upside down depending on the object’s distance from the mirror, used in car headlights. – Convex-curves outward, image is right side up and smaller than the original object, used as side mirrors on cars. Lenses and Refraction of Light • A lens is a transparent object that forms an image by refraction, or the bending of light. • Lenses are classified by their shape. • No matter what type of lens you have, the electromagnetic wave that passes through the center of the lens is not reflected or refracted. • Types of lenses – Convex-thicker in the middle than along the edges, used in magnifying glasses and cameras – Concave-thinner in the middle than along the edges, used in microscopes and eye glasses. Lasers and Laser Light • Electromagnetic waves can be utilized by technological devices that are used in every day life. • A laser is a device that produces intense visible light at only one wavelength and in only one color. • Laser light is tightly focused and does not spread out like non-laser light does. • Lasers can be used to precisely cut materials, in CD players, and in medical instruments. Polarized Light • Polarized light is made of light waves that vibrate in only one plane. • The light that bounces off of a horizontal surface is know as glare. Glare is an example of polarized light.