# Convex Mirrors Convex Mirrors Convex Mirror F and

• Slides: 10

Convex Mirrors

Convex Mirrors Convex Mirror F and C are behind mirror 2

Principle Rays – Same as in Concave Mirrors Always remember that when locating an image – ALL RAYS ORIGINATE FROM THE OBJECT!

Convex Mirrors Focal Point For convex mirrors: l Parallel rays hitting a spherical mirror appear to come together (intersect) at the focal point l Focal point, F, is behind mirror l 2 F = C Note: use dotted lines to represent “imaginary” light rays 4

Image Formation using Ray Diagrams for a Convex Mirror Image Properties L behind mirror O upright S smaller than object T virtual Image properties are same regardless of object location See animation 5

Image Formation using Ray Diagrams for a Convex Mirror § For a convex mirror, rays from the object will diverge (i. e. spread out) upon being reflected, thereby appearing to originate behind the mirror. § The image is located where the projections (dashed lines) of the three rays cross (intersect). Use dashed lines to extend rays behind mirror. § The size of the image can be determined if you draw your diagram to scale. 7

Image Properties (LOST) for Concave/Convex Mirrors Concave Mirror L varies O Upright or Inverted S varies T real or virtual Image properties depends on object location Convex Mirror L behind mirror O upright S smaller than object T virtual Image properties are same regardless of object location 8

Complete Ray Diagrams for Different Object Locations Complete the 2 nd page of the ray diagrams worksheet.

TRY ONE! An object 5 cm high is placed 10 cm in front of a convex mirror with a focal length of 20 cm. Using a scale ray diagram indentify the characteristics of the image. 10