the turning back of an electromagnetic wave at the surface of a substance INCIDENT RAY REFLECTED RAY

Line normal to the surface ’’ Angle of incidence =Angle of reflection

Smooth flat surface – water, mirror

Each light ray follows the law of reflection

OBJECT You think light came from back here

OBJECT You think light originated here IMAGE

OBJECT You think light originated here IMAGE an image formed by light rays that only appear to intersect

An inwardly curved, mirrored surface that is a portion of a sphere and that converges incoming light rays Notice that the lines normal to the surface all cross through the “center or curvature”

PRINCIPAL AXIS The “focal point” of the lens is ½ of the radius of curvature

PRINCIPAL AXIS OBJECT RAY 1 goes in parallel to principal axis comes out through focal point

PRINCIPAL AXIS OBJECT RAY 2 goes in through focal point comes out parallel to princ axis

PRINCIPAL AXIS OBJECT RAY 3 goes in through center of curv. comes out back along itself

PRINCIPAL AXIS OBJECT You think light originated here IMAGE IMAGE IS ERECT ( right side up ) AND MAGNIFIED

OBJECT Reflected rays cross here

OBJECT an image formed when rays of light actually intersect at a single point Image is inverted

1p1p 1q1q 1f1f + = Object distance from mirror Image distance from mirror Focal length

OBJECTIMAGE p1p 1q1q 1f1f + = Predict location of image =.8q

OBJECTIMAGE p1p 1q1q 1f1f + = Predict location of image =.8q1.35 q = -.51 cm Negative means it is on the other side VIRTUAL