light

Question 1

radiated heat travels through space from the sun to earth as…

Answer 1

infrared radiation

Question 2

what is infrared radiation?

Answer 2

electromagnetic radiation with wavelengths longer than those of visible light

Question 3

radiated heat and light are examples of what?

Answer 3

examples of electromagnetic radiation

Question 4

what can electromagnetic waves travel through?

Answer 4

they can travel through vacuum, and don’t need anything to transmit to

Question 5

what speed does light travel at?

Answer 5

300 000 kms/s

Question 6

electromagnetic waves are like sound waves. why?

Answer 6

because they both have a specific frequency and wavelength

Question 7

define luminous

Answer 7

an object that emits light

Question 8

define reflection

Answer 8

the bouncing of light off something and into you eyes

Question 9

define regular reflection

Answer 9

regular reflection is when light reflects off a very smooth surface and produces a clear image

Question 10

define diffuse reflection

Answer 10

diffuse reflection is when a rough surface reflects light in many directions and don’t form an image

Question 11

define the law of reflection

Answer 11

the law stating that the light is reflected at the same way it was hit

Question 12

incident ray

Answer 12

incoming ray

Question 13

reflected ray

Answer 13

ray that bounces off

Question 14

can you label a law of reflection diagram?

Answer 14

(search up an unlabelled diagram of the law of reflection)

Question 15

define plane mirror

Answer 15

a flat mirror

Question 16

define lateral inversion

Answer 16

lateral inversion is when everything on the plane mirror is reversed sideways

Question 17

define virtual image

Answer 17

an image formed in which the rays of light do not actually meet, but only at the inside of a mirror

Question 18

define refraction

Answer 18

the bending of light as it passes from one transparent substance into another

Question 19

define refractive index

Answer 19

a measure of how easily light travels through a substance

Question 20

the smaller the refractive index of a material…

Answer 20

the faster the light will travel through a material

Question 21

what happens when light travels through air and enter glass?

Answer 21

it slows down and bends and bends in the direction of the normal

Question 22

what is air’s lowest refractive index?

Answer 22

1.00

Question 23

higher the refractive index…

Answer 23

the more light bends

Question 24

define angle of incidence

Answer 24

the angle an incoming makes with the normal

Question 25

define angle of reflection

Answer 25

the angle a reflected ray makes with the normal

Question 26

define angle of refraction

Answer 26

the angle a refracted ray makes with the normal

Question 27

what happens to light when it enters a substance of lower refractive index? (ex: glass into water)

Answer 27

it is refracted away from the normal

Question 28

define critical angle

Answer 28

the angle of incidence of light that produces an angle of refraction of 90 degrees

Question 29

define total internal reflection

Answer 29

when light is completely reflected from the boundary of two substances, it occurs when the angle of incidence is greater that the critical angle

Question 30

define real image

Answer 30

an image formed when rays of light actually meet

Question 31

define concave lens and what does it cause?

Answer 31

a lens that curves inwards, it causes light rays to come together

Question 32

define convex lens and what does it cause?

Answer 32

a lens that curves outwards, it causes light rays to read out