Optics - 'What is Light? and Reflection

:)

What is light?

an electromagnetic wave

When an object emits light, it is...

luminous

When an object does not emit light, it is...

non-luminous

Incandescence

light produced from heat

Example of incandescence

lightbulb, the sun

Electrical discharge

light produced by electricity passing through a gas (that glows - different gases have different colours)

Example of electrical discharge

lightning

Phosphorescence

light produced by the absorption and slow release of UV rays (as light/energy)

Example of phosphorescence

glow in the dark stars

Fluorescence

light produced by the absorption and immediate release of UV rays (as light/energy)

Chemiluminescence

light produced by a chemical reaction - cold light

Example of chemiluminescence

glow sticks

Bioluminescence

light produced by chemiluminescence in organisms

Triboluminescence

light produced by broken or scraped crystals

Example of triboluminescence

crunching wintergreen mints

LED's (light emitting diodes)

light produced by electrical currents (semi conductors)

Example of LED's

christmas lights

Lasers

light produced by electrical current (semi-conductor)

LASER stands for...

light amplification of stimulated emission of radiation

Lasers have light that is pure in...

colour

A laser's colour is pure in colour because the light is _______ and waves move in _______

focused, unison/one direction

Diffuse reflection occurs when light reflects off a ______ surface...

rough

Specular reflection happens when light reflects off of a _______ surface

smooth (reflective)

A plane is a...

flat mirror

the line between theta i and theta j is the...

normal

what is the light heading toward a surface called?

incident ray

what is the light reflecting off a surface called?

reflected ray

what rule of reflection involves angles?

the angle of incidence equals the angle of reflection

what rule of reflection involves a plane?

an incident ray, reflected ray, and normal all lie on the same plane

S

size

A

attitude

L

location

T

type

Types of images

real, virtual

What point connects both rays? The ____

vertex

What does 'C' represent?

centre of curvature

What does 'F' represent?

focus point

Types of 'c' mirrors

concave and convex

If an object is behind c off a concave mirror, the image will be r_______ and s______

real and smaller

If an object is within f and c of a concave, the image will be r______ and l______

real and larger

If an object is on f in front of a concave mirror, the image will (not...)

not exist

If an object is in front of f (concave), the image will be v______ and l_____

virtual and larger

If an object is reflected in a convex mirror, the image will be v______ and s_______

virtual and smaller