Plane mirror, a flat smooth surface that reflects light, Virtual image, an image your brain sees even if no light pass through the location of the image, Concave mirror, mirror whose surface curves inward, Optical axis, imaginary straight line drawn perpendicular to the surface of the mirror at its center, Focal point, point where light rays converge (meet), Focal length, distance from center of mirror to focal point, Real image, image when light rays converge, Convex mirror, a mirror that curves outward, Convex lens, lens that is thicker in the middle than at the edges, Concave lens, lens that is thinner in the middle and thicker at the edges, Cornea, transparent covering of the eyeball, Retina, inner lining of the eye, Refracting telescope, telescope that uses lenses to gather light from distant objects, Reflecting telescope, telescope that uses mirrors and lenses to collect and focus light from distant objects, Microscope, a device that uses two convex lenses with relatively short focal lengths to magnify small, close objects

Gr 8 Chapter 5

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