# Convex Mirrors. 2 Convex Mirror F and C are behind mirror.

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Convex Mirrors

2 Convex Mirror F and C are behind mirror

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

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

5 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

7 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.

8 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

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

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

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