Light, Mirrors, and Light, Mirrors, and LensesLenses

O 4.2 Reflection and MirrorsO 4.2 Reflection and Mirrors

Reflection and MirrorsReflection and Mirrors Law of Reflection – the angle of Law of Reflection – the angle of

incidence is equal to the angle of incidence is equal to the angle of reflectionreflection

Diffuse reflection – reflection off of a Diffuse reflection – reflection off of a rough surfacerough surface

Regular reflection – reflection off of a Regular reflection – reflection off of a smooth surfacesmooth surface

Reflection and MirrorsReflection and Mirrors Equal distancesEqual distances

Object – mirror Image – mirrorObject – mirror Image – mirror Concave mirror )Concave mirror ) Convex mirror (Convex mirror ( Optical axis – imaginary line down the Optical axis – imaginary line down the

center of a mirrorcenter of a mirror Focal point – point where all the light Focal point – point where all the light

convergeconverge

Reflection and MirrorsReflection and Mirrors Focal length – length of the focal point to Focal length – length of the focal point to

the mirrorthe mirror →→ ) , if the object is farther away than the ) , if the object is farther away than the

focal point, the image will be upside focal point, the image will be upside downdown

→→ ), if the object is within the focal point, ), if the object is within the focal point, the image will be right side upthe image will be right side up

→ → ((, the image will be small., the image will be small.