y8 lightttt

Question 1

Light is ‘transmitted’

Answer 1

Hits object and passes through

Question 2

Light is ‘absorbed’

Answer 2

Hits object and stops

Question 3

Light is ‘reflected’ or ‘scattered’

Answer 3

Hits object and bounces off

Question 4

An object that gives out light is _________

Answer 4

Luminous

Question 5

If an object isn’t luminous, how can we see it

Answer 5

Lights reflects off it and into our eyes

Question 6

A material that lets light through without scattering is _________

Answer 6

Transparent

Question 7

A material that does not let light pass through is _________

Answer 7

Opaque

Question 8

An object that scatters light as it passes through is __________

Answer 8

Translucent

Question 9

What is the normal line

Answer 9

An imaginary line 90 degrees from the reflective surface

Question 10

The angle of __________ and angle of ________ are _________

Answer 10

Incidence
Reflection
Equal

Question 11

Angles are measured from the _________

Answer 11

Normal

Question 12

A material that light bounces off

Answer 12

Reflective

Question 13

If the speed of light slows (enters a new medium eg. air to water) it will bend ________

Answer 13

Towards normal

Question 14

If the speed of light quickens (enters a new medium eg. water to air) it will bend ________

Answer 14

Away from normal

Question 15

The angle of refraction cannot be greater than _______ degrees.

Past the critical angle, light is _________ rather than __________

As the angle of incidence ________, the angle of refraction gets closer to ninety degrees.

At any angle of incidence greater than the critical angle, the light cannot pass through the surface - it is all ________

Answer 15

90
reflected
refracted
increases
reflected

Question 16

Why is total internal reflection called that

Answer 16

Total because all of the energy is reflected
Internal because the energy stays inside the material
Reflection because the light is reflected

Question 17

What is the critical angle

Answer 17

The critical angle is defined as the angle of incidence that provides an angle of refraction of 90 degrees. It is the angle at which the refracted ray is parallel to the boundary between two mediums. IT IS NOT ALWAYS 90 DEGREES.

Question 18

When the angle of incidence is ________ than the critical angle, all light will be ________

Answer 18

Greater
Reflected

Question 19

theres this um photo thing that the teacher said to learn but i don’t have premium so i can’t put a picture on a flashcard so all you get is it’s on the bottom of page 45 and all of 46 in the booklet

Answer 19

yay broke cheap life hacks

fun

Question 20

What are fibre optic cables made from

Answer 20

Glass/plastic

Question 21

Why is fibre optic cables being able to send signals over long distances an important thing

Answer 21

Communication eg. superfast broadband, endoscopes

Question 22

Iris (ha my silly villi)

Answer 22

Coloured circle, controls size of pupil and therefore amount of light entering eye

Question 23

Pupil

Answer 23

Black part of eye, hole in iris, lets light in

Question 24

Cornea

Answer 24

Transparent, protective, refracts light

Question 25

Lens

Answer 25

Focuses light onto retina

Question 26

Retina

Answer 26

Light sensitive layer of cells at back of eye, made of rods and cones

Question 27

Optic nerve

Answer 27

Carries messages (nerve impulses) to brain

Question 28

Sclera

Answer 28

White protective coating of eye

Question 29

How light from an object ends up being an image in our brain

Answer 29

1.) Light rays are reflected off the object and enter the pupil 2.) Ray is refracted by lens and cornea 3.) Rays meet on retina and form an inverted image 3.) Optic nerve sends electrical impulses from the retina to the brain

Question 30

Our eyes only have sensors to detect _____, _______, and _______ light. All other colours are perceived as ___________

Answer 30

Red Green Yellow Mixtures of these

Question 31

Mixing two lights of any colour will always result in a _________ light

Answer 31

Brighter

Question 32

Frequencies of colours (lowest to highest)

Answer 32

Red Orange Yellow Green Blue Indigo Violet

Question 33

High frequency colours slow down ________ when changing to a different medium, so they bend _______

Answer 33

More More

Question 34

Refraction

Answer 34

Light changing speed/direction as it enters a new object. The change in direction of a wave when it changes speed

Question 35

The colour an object is depends on the light it _______. Other colours (the colours it ______) are ________

Answer 35

Reflects Isn't Absorbed

Question 36

An object is white if it _________

Answer 36

Reflects all colours

Question 37

An object is black if it ________

Answer 37

Absorbs all colours

Question 38

What do we call the effect when light enters a prism and it splits into the colours of the spectrum

Answer 38

Dispersion

Question 38

Do light waves travel fastest through solids, liquids, or gases

Answer 38

Gases (light travels fastest in a vacuum)