Physics Y9 Light

Question 1

what colours does a white object reflect/absorb

Answer 1

reflects: r g b absorbs: -

Question 2

what colours does a black object reflect/absorb

Answer 2

reflects: - absorbs: r g b

Question 3

what colours does a blue object reflect/absorb

Answer 3

reflects: b absorbs: r g

Question 4

what colours does a red object reflect/absorb

Answer 4

reflects: r absorbs: g b

Question 5

what colours does a green object reflect/absorb

Answer 5

reflects: g absorbs: r b

Question 6

what colours does a magenta object reflect/absorb

Answer 6

reflects: r b absorbs: g

Question 7

what colours does a yellow object reflect/absorb

Answer 7

reflects: r g absorbs: b

Question 8

what colours does a cyan object reflect/absorb

Answer 8

reflects: b g absorbs: r

Question 9

what is light

Answer 9

the portion of the electromagnetic spectrum which is visible

Question 10

what portion of the electromagnetic spectrum does visible light cover

Answer 10

400-700nm

Question 11

how are waves of energy transmitted

Answer 11

electromagnetic radiation

Question 12

how does light travel

Answer 12

in straight lines

Question 13

which parts of the eye refract light

Answer 13

cornea and lens

Question 14

which part of the eye is sensitive to light

Answer 14

retina

Question 15

which part of the eye carries electrical impulses to the brain

Answer 15

optic nerve

Question 16

how does a mirror work

Answer 16

light reflects off of an object, then off of the mirror and into your eyes, all in straight lines

Question 17

what is the normal

Answer 17

an imaginary line 90° to a mirror or a place of refraction

Question 18

what is the ray that goes into the mirror called

Answer 18

incident ray

Question 19

what is the ray that comes out from the mirror called

Answer 19

reflection ray

Question 20

what is the angle in between the incident ray and the normal

Answer 20

angle of incidence

Question 21

what is the angle in between the reflection ray and the normal

Answer 21

angle of reflection

Question 22

angle of incidence (</>/=) angle of reflection

Answer 22

=

Question 23

what is the law of reflection

Answer 23

angle of incidence = angle of reflection

Question 24

is a virtual image real

Answer 24

no

Question 25

what is specular reflection

Answer 25

reflection from a smooth surface

Question 26

what is diffuse reflection

Answer 26

reflection from a rough surface

Question 27

can an image be seen in specular reflection

Answer 27

yes

Question 28

can an image be seen in diffuse reflection

Answer 28

no

Question 29

what colour is the least reflective

Answer 29

black

Question 30

what colour is the most reflective

Answer 30

white

Question 31

can light bend

Answer 31

no

Question 32

can light change direction

Answer 32

yes

Question 33

what is the angle in between the ray of refraction and the normal

Answer 33

angle of refraction

Question 34

if light travels from a more to less dense medium angle of incidence (/=) angle of refraction

Answer 34

<

Question 35

if light travels from a less to more dense medium angle of incidence (/=) angle of refraction

Answer 35

>

Question 36

why does light refract

Answer 36

it changes speed

Question 37

what happens when white light refracts through a prism

Answer 37

a spectrum is created

Question 38

what are the traditional colours of the rainbow in order

Answer 38

red (orange) yellow green blue (indigo) violet

Question 39

which colour has the longest wavelength

Answer 39

red

Question 40

which colour has the shortest wavelength

Answer 40

violet

Question 41

what is dispersion

Answer 41

the seperation of light by wavelength

Question 42

why is green green

Answer 42

because the human brain perceives it as green

Question 43

what does a colour filter do

Answer 43

absorbs certain wavelengths and transmits others