Optics 10

Angles/Rays

100

Angle of incidence

angle at which light enters the mirror

200

Angle of reflection

angle at which light leaves a mirror

300

Incident ray

ray of light that enters a mirror

400

Reflected ray

ray of light that leaves a mirror

Refractions

100

What it is

light passes through a medium and bends (angle of refraction)

200

when the speed of light is slower in the medium

bends towards normal

300

when speed of light in medium is faster

bends away from normal

400

Index of Refraction

n=c/v

500

what c is always equal to (speed of light)

3.0 times 10⁸ m/s

Reflections

100

reflection on a smooth surface. Law of Reflection applies

specular reflection

200

reflection on rough surfaces. No law of reflection

diffuse reflection

Mirrors

100

concave

converging-positive f-cosmetic mirrors, dental mirrors

200

convex

diverging, negative f, sideview mirror, security mirror.

300

Magnification

M=-di/do=hi/ho

400

Focal length

1/f=1/di+1/do

Convex- (-f)

Lenses

100

converging

light rays bend and meet

200

diverging

light rays bend and move away from each other

300

difference in SALT for lenses

real is o and i on different sides of lens.

virtual is o and i on same side of lens.

400

equations

same as for mirrors