9 Concave & Convex Mirror Diagrams Concave and convex mirror usesReal vs. Virtual imagesRay Diagrams:Behaviour of light when it hits a curved mirrorVertex, Principal Axis, Center of Curvature, Focal Point, Focal length, NormalCharacteristics and positions of images (SALT)
10 Concave vs. Convex mirrors When rays that are parallel to the principal axis strike a concave mirror, they are ALL reflected through the same point, called the focal point.If several groups of parallel rays are reflected by a concave mirror, each group converges at a point.
11 Concave vs. Convex mirrors Concave mirrors are also called converging mirrorsConcave mirrors are designed to collect light and bring it to a single pointExamples: Cosmetic mirrors to produce an enlarged image, Telescopes to collect light from a distance source and focus it for viewingConcave mirrors can also be used to send out beams of light raysExamples: flashlights, car headlights, dental examination lights
13 Concave vs. Convex mirrors Convex mirrors are also called diverging mirrorsConvex mirrors spread out raysThey allow you to view a large region that you could not see with a plane mirror of the same sizeExamples: Store security, parking lot safety, side-view mirrors, camera phones
14 Real vs. VirtualA real image is formed by light rays that converge at the location of the image.A real image can be projected onto a screen: If you place a piece of paper at the spot where a real image forms, a focused image will appear on the piece of paper.A virtual image is any image formed by rays that do not actually pass through the location of the image.Light rays are not coming from where the image appears to be.Unlike a real image, a virtual image cannot be projected onto a screen.
15 Curved mirror definitions When parallel light rays strike a curved mirror, the reflected rays eventually meet at a common point. The point where the light rays meet, or appear to meet, is called the focal point, F.The middle of a curved mirror is the vertex. The principal axis is an imaginary line draw through the vertex.The distance from the vertex to the focal point is the focal length, f.The center of curvature, C, is the center of the circle that would be formed if you extended the curve of the mirror.The focal point is half way between the center of curvature and the vertex.
16 Finding the imageEach time you find the image, you must determine the following:Size: Is it smaller, bigger, or the same size as the object?Attitude: Is it upright or inverted?Location: Is it behind or in front of the mirror?Type: Is it real of virtual?
17 +/- M Equations Magnification Mirror Equation ***SIGN CONVENTIONS Positive focal length for concave mirrorsNegative focal length for convex mirrors***SIGN CONVENTIONS