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# Concave (converging) Mirrors

Date post:23-Feb-2016
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Textbook Reference 10.3 (P.419-430). Concave (converging) Mirrors. Learning Goals. Understand how to draw ray diagrams for concave mirrors Be able to identify when images are real or virtual Success Criteria - PowerPoint PPT Presentation
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Concave Mirrors

Concave (converging) Mirrors

Textbook Reference 10.3 (P.419-430)Learning GoalsUnderstand how to draw ray diagrams for concave mirrorsBe able to identify when images are real or virtual

Success CriteriaTo draw at least one ray diagram for concave mirrors and to identify if the image is real or virtual.

Curved MirrorsMirrors with a single curvature find many uses in our homes and optical devices. To make a curved mirror, you must make part of the surface of the sphere reflective. There are two types of curved mirrors: Concave (converging) Convex (diverging).

1. Concave (Converging) Mirror: Shaped like part of the surface of a sphere in which the inner surface is reflective. For example, similar to the surface of a bowl.2. Convex (Diverging) Mirror: Shaped like part of the surface of a sphere in which the outer surface is reflective.

Types of Curved Mirrors

Concave Mirror TerminologyCentre of Curvature:The centre of the sphere whose surface has been used to make the mirror. Its the point at which the normals meet. Labelled C.Principal Axis: The line through the centre of curvature to the midpoint of the mirror.Vertex: The point where the principal axis meets the mirror. Labelled V.Focus or Focal Point:The point at which light rays parallel to the principal axis converge (meet at a common point) when they are reflected off a concave mirror. Labelled F.

Principle Axis (PA)Focus (F)Centre of Curvature (C)Vertex

Concave MirrorsFocal lengthLight comesfrom this sideLocating Images in Concave MirrorsTo determine the image of an object in front of a concave mirror, you need to draw at least two incident rays from the top of the object.

RULES:1. A light ray parallel to the principal axis is reflected through the focus.

Locating Images in Concave MirrorsRULES ... Cont`d:2. A light ray through the centre of curvature is reflected back into itself.3. A ray through the focus will reflect parallel to the principal axis.4. A ray aimed at the vertex will follow through the law of reflection.

EXAMPLE ... FIND THE IMAGERecall what a REAL IMAGE is ...A Real Image is an image that can be seen on a paper screen as a result of light rays actually arriving at the image location.

Real Image:Formed when reflected rays (not extended rays) meetLocated in the front of the mirrorYou need a screen to see the real image

EXAMPLE ... FIND THE IMAGESALT... SIZE (smaller, larger, or same), ATTITUDE (upright or inverted), LOCATION, and TYPE (real or virtual)SALT ...SIZE = LargerATTITUDE = InvertedLOCATION = Beyond CTYPE = RealJIGSAWThere are 5 scenarios to investigate with Concave mirrors.You will be placed in groups and assigned a scenario to work on, during which time you will become the `expert` on that scenario.Afterwards, everyone will JIGSAW into another group where you will all have a turn to `teach` your new group members about your concave mirror scenario.

Please reference your textbook (p.422-424) during this activity.JIGSAW GROUPSGROUP 1GROUP 2GROUP 3GROUP 4GROUP 5AdomaJuliaAkinHayaAngelicaAnnamariaAnthonyVictorAndreAlexHelderStephanieMichaelIvoCristianVanessaJonathanAlissiaJosieGabrielDavidAbdullahHigorMatthewSevakStephenRaffaelaRachelVictoria

OBJECTIMAGE CHARACTERISTICSLOCATIONSIZE(smaller, larger, or same)ATTITUDE(inverted or upright)LOCATIONTYPE(Real or virtual)Beyond C

At C

Between C and FAt F

Between F and mirrorSUMMARY: IMAGING PROPERTIESOF A CONVERGING MIRROROBJECTIMAGE CHARACTERISTICSLOCATIONSIZE(smaller, larger, or same)ATTITUDE(inverted or upright)LOCATIONTYPE(Real or virtual)Beyond C

SMALLERINVERTEDBETWEEN C & FREALAt C

SAMEINVERTEDAT CREALBetween C and FLARGERINVERTEDBEYOND CREALAt F

NO CLEAR IMAGEBetween F and mirrorLARGERUPRIGHTBEHIND MIRRORVIRTUALSUMMARY: IMAGING PROPERTIESOF A CONVERGING MIRRORThe following 5 slides are for reference purposes.

Case 1: The object is locatedbeyondC When an object is located beyond C, the image will always be located between C and the Focus. The image will be inverted. The image is reduced in size. The image is real.

Case 2: The object is located at C When an object is located at C, the image will also be located C. The image will be inverted. The image is the same size. The image is real.

Case 3: The object is located between C and F When an object is located between C and F, the image will be located beyond C. The image is inverted. The image is larger. The image is real.

Case 4: The object is located at F When the object is located at F, there is no image formed. WHY Light rays from the same point do not converge. Reflected rays are parallel and do not form images.

Case 5: The object is locatedin front ofF (between F and the mirror) When an object is located between F and the mirror, the image will always be located somewhere on the opposite side of the mirror. The image is upright. The image is larger. The image is virtual. This is because the rays diverge and our brain extrapolates the rays backwards to where they appear to originate.

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