Images in a Curved Mirrors Concave Mirrors Terminology

Images in a Curved Mirrors Concave Mirrors

Terminology of Concave Mirrors C – centre of curvature – centre of the sphere PA – principal axis – line going through C C F V PA F – focus – point where parallel light rays come together V – vertex – point where PA meets mirror focal point focal length

How to Locate the Image in a Concave Mirror Three light rays must be drawn originating from the top of the object: 1. Ray travels parallel to the PA and reflects through the F 2. Ray travels through F and reflects parallel to the PA 3. Ray travels to V and reflects at the same angle of incidence C F V 2 3 1 concave mirror demonstration

Image Location in a Concave Mirror Object is located beyond C 2 3 1 S – smaller A – inverted L – between F and C T - real

Image Location in a Concave Mirror Object is located at C 2 3 1 S – same A – inverted L – at C T - real

Image Location in a Concave Mirror Object is located between F and C 2 3 1 S – larger A – inverted L – outside C T - real

Image Location in a Concave Mirror Object is located at F 1 2 NO IMAGE FORMED

Image Location in a Concave Mirror Object is located within F 2 1 3 S – larger A – upright L – behind mirror T - virtual

Why Two Different Reflections?

Image Characteristics of a Concave Mirror Image Object Beyond C At C Between C and F Size Attitude Location Type smaller inverted between C and F real same size inverted larger inverted At F inside at C beyond C real no clear image larger upright behind mirror virtual THE SIZE AND TYPE OF IMAGE DEPENDS ON LOCATION OF OBJECT concave mirror demonstration

Use of Concave Mirrors - make-up mirrors – make the image larger than the object - flashlight – parallel beams of light - Dentists - to focus light on the tooth that is being examined

Bathroom Mirror

Light