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Mirrors and Lenses A mirror is a sheet of glass that has a smooth, silver-colored coating on one side. When light passes through the glass, the coating.

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Presentation on theme: "Mirrors and Lenses A mirror is a sheet of glass that has a smooth, silver-colored coating on one side. When light passes through the glass, the coating."— Presentation transcript:

1 Mirrors and Lenses A mirror is a sheet of glass that has a smooth, silver-colored coating on one side. When light passes through the glass, the coating on the back reflects the light regularly, allowing you to see an image. An image is a copy of an object formed by reflected or refracted rays of light. Images can be identical, larger, or smaller, depending on the shape of the mirror. Plane Mirrors A plane mirror is a flat mirror. A plane mirror produces an image that is right-side up and the same size as the object being reflected. (a virtual image) Virtual images are right-side up, or upright. The brain treats reflected rays as if they had come from behind the mirror, and so that is where an image appears to be located.

2 Concave Mirrors A mirror with a surface that curves inward like the inside of a bowl is a concave mirror. A concave mirror reflects rays of light so that they meet at a point called the focal point. Concave mirrors can form either virtual images or real images – depends on whether the object is closer to the mirror than the focal point or farther away from the mirror than the focal point. Object/focal point/mirror = real image Focal point/object/mirror = virtual image A real image is formed when rays actually meet at a point and the image appears to be upside-down, or inverted. Examples – car headlights, makeup mirrors

3 Convex Mirrors A mirror with a surface that curves outward is called a convex mirror. Reflected light rays spread out but appear to come from a focal point behind the mirror. Since the rays do not meet, images formed by convex mirrors are always virtual. Images appear smaller and farther away than the actual object. Examples: Car door mirrors

4 Convex Lenses Concave Lenses
A lens that is thicker in the middle than at the edges. Can form real and virtual images If object is less than 1 focal length away, virtual image If object is more than 2 focal lengths away, real image Examples: Magnifying lenses and camera lenses Concave Lenses A lens that is thinner in the middle than at the edges. Only forms virtual images Examples: Microscopes and eyeglasses

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