Physics Optics Quiz review

Linear propogation

Light travels in a straight line

Dispersion

Visible light can be split into a spectrum of colors.

Speed of Light

V=3.0 × 10⁸m/s in air

Travels at 300000000m/s

Bundles of light energy are called

Photons

Light is invisible until..

It hits an object and reflects into your eye

Refraction and reflection

..can change the direction of light

Light has properties of both…

Atoms and waves

Light is a formal wave that can travel through…

Space and it does not require a medium

Definition: electromagnetic waves can travel through an empty space without needing water/air to propogate

Name the types of rays (electromagnetic spectrum).

👇 Increasing energy of light photons

Decreasing wavelength ➡

__________________________________________

Large wavelength. Very small w.l

Radio waves, microwaves, infrared light, visible light, UV light, x-ray, gamma rays (RMIVUXG)

How light is produced: Objects are either:

Luminous: produce light or are non-luminous (only reflect light)

Incandescence:

Light resulting from increased temperature

Eg; molten lava, light from candle, incandescent light bulb

Electric discharge

Light passing through an electric current through a gas

Eg: neon lit signs, lightning⚡

Phosphorescence

Objects that absorb non-visible UV light and then give off an energy visible light slowly over a period of time

Eg. Glow-In-The-Dark anything

Fluorescence

Immediate production of visible light as a result of absorbing non vis UV light

Eg: dye in detergent makes clothes appear brighter- not actually clean

For ref: more light produces less heat and uses less electricity than incandescent light bulbs

Chemiluminescence

A light produced from a chemical reaction with little or no heat produced

Eg: glow sticks have glass inside them that break and mix with a chem to glow

Bioluminescence

Chemiluminescence occurring in living things (fire flies, angler fish, crystal jelly fish)

Triboluminescence

Production of light by friction or when certain objects such as crystals are scratched, rubbed, or crushed together

Eg. 2 quarts crystals, crushing sugar

Light emitting diode (LED)

Light produced a low temperature as a result of electricity flowing through an electrical current

Eg: Christmas lights, Street lights

Lasers: LASER stands for…

Light Amplification by Stimulated Emission of Radiation

Lasers: Unlike other sources of light …

Laser light is a semiconductor and contains a single color or wavelength of light

Lasers: Like other sources light…

A pack of laser light can only be seen if it reflects a substance (then we'll be able to see it)

List unique properties of laser light beams

-Does not radiate light

-Much more intense and can damage eyes

Examples of how a laser's properties are used in real life

High energy lasers can burn holes through steel in manufacturing

Medicine to cut through skin or even for cataract surgery

The laws of reflection:

State 1st law of reflec

Ang of incidence equals angle of reflection

State second law of reflection-

The incident ray, reflected ray and normal ray are all in the same place