SNC2D - Optics

What is light?

a form of energy radiation

What is the speed of light?

3 × 10⁸ m/s

Light travels in straight lines when it is a _____ distance in a _____ medium

short, single

Why are shadows created?

light does not bend around objects

Light is a type of _____

electromagnetic wave

Electromagnetic waves do not require a _____ in order to travel

medium

Electromagnetic waves have both _____ and _____ properties

electric, magnetic

Electricity and magnetism can be _____ or _____

static, kinetic

Electromagnetic waves are formed when an _____ couples with a _____

electric field, magnetic field

The magnetic and electric fields of an electromagnetic wave are _____ to each other and to the direction of the wave

perpendicular

What is the part of the electromagnetic spectrum humans can see called?

visible light

What is the range of visible light?

400 nm to 700 nm

What is the order of sections on the electromagnetic spectrum?

gamma rays, x rays, ultraviolet, visible spectrum, infrared, microwaves, radio waves

The further to the left of the spectrum you go, the _____ the frequency and the _____ the wavelength

higher, shorter

The further to the right of the spectrum you go, the _____ the frequency and the _____ the wavelength

shorter, longer

What are some examples of radio waves?

radios, TV signals, radars

What are some examples of microwaves?

microwaves, wi-fi/bluetooth, satellite communication

What are some examples of infrared?

remote controls, thermal cameras

What are some examples of visible light?

light bulbs, sunlight

What are some examples of ultraviolet?

sunburn, sterilization

What are some examples of x-rays?

medical imaging, security screening

What are some examples of gamma rays?

cancer treatment, nuclear reactions

What is wavelength?

the distance between two corresponding points on adjacent waves

What is the crest of a wavelength?

the top of the wave

What is the trough of a wavelength?

the bottom of the wave

What is wave frequency?

the number of wave cycles that pass a fixed point in one second

What is white light?

the combination of all colours on the visible light spectrum

Some objects are luminous meaning they…

produce their own light

Some objects are non-luminous m

Colours of objects are the wavelengths that were…

not absorbed

Light produced by heated objects is called…

incandescence

What is an example of incandescence?

light bulbs

When an electric charge runs through a gas, producing light, it is called…

electrical discharge

What is an example of electrical discharge?

lightning

The light produced when UV radiation hits a phosphor is called…

fluorescence

What is a phosphor?

a fluorescent material

Fluroescence only gives off light when…

energy is on

Some phosphors take in light energy, and when the initial source is removed, they give back the light energy in a process called…

phosphoresecence

Phosphorescence only gives off light when…

the energy is off

What is an example of fluorescence?

fluorescent light bulbs

What is an example of phosphorescence?

glow in the dark stickers

During some chemical reactions, chemicals will emit light in a process called…

chemiluminescence

What is an example of chemiluminescence?

glowsticks

The process in which chemical light is produced in living organisms is called…

bioluminescence

The process in which light produced when types of crystals are crushed is called…

triboluinescence

What are LEDs?

light emitting diodes

What are lasers?

super organized light waves

How can we describe images?

size, attitude, location, type

What is size?

the size of the image

What is attitude?

upright or inverted image

What is location?

image distance from the mirror

What is type?

virtual or real image

What is lateral inversion?

a swapping of left and right