light

Question 1

WHAT IS LIGHT?

Answer 1

• a form of energy
• light travels in waves
• light doesn’t need matter to move.

Question 2

HOW FAST DOES LIGHT TRAVEL?

Answer 2

up to 300,000 km/s

Question 3

short wave lengths…

Answer 3

have high frequencys

Question 4

long wave lengths…

Answer 4

have low frequencys

Question 5

what is all light made up of?

Answer 5

The electromagnetic spectrum

Question 6

Different type of waves. Ranked low to high?

Answer 6

radio waves
microwaves
infrared
visible light
ultra violet
x-rays
gamma rays

Question 7

luminous objects -

Answer 7

produce light

Question 8

non luminous objects -

Answer 8

reflect light hence why we can see them

Question 9

transmitted

Answer 9

light passes through transparent objects

Question 10

reflected

Answer 10

light bounces of objects

Question 11

absorbed

Answer 11

objects take light energy and convert it to heat

Question 12

Primary Colours?

Answer 12

Red, green and blue

Question 13

law or reflection

Answer 13

Law of reflection states that, the angle of incidence (∠i) is always equal to the angle of reflection (∠r).

Question 14

lateral inversion

Answer 14

looking at a plane mirror, and the and the writing appears backwards

Question 15

concave mirrors

Answer 15

light rays converge infront of the mirror making the focal point in front. its a real image.

Question 16

convex mirror

Answer 16

Curves Outwards and makes a focal point behind the mirror. Its a virtual image.

Question 17

Real image

Answer 17

Light converges

Question 18

Virtual

Answer 18

Light diverges

Question 19

inverted image

Answer 19

image appears upsidedown

Question 20

upright image

Answer 20

image appears on the verticle plane

Question 21

The normal

Answer 21

am imaginary line that right angles to the surface

Question 22

the angle of incidence

Answer 22

is the angle between the normal and the incident ray

Question 23

what happens when light strikes a medium at 90 degrees

Answer 23

it slows down however keeps its journey straight.

Question 24

Rules of refraction

Answer 24

When light enters a more dense medium at an an angle, is bent towards the normal

Question 25

when light passes through a convex lense

Answer 25

Lights converge

Question 26

when light passes through a concave lense

Answer 26

Light diverges

Question 27

violet

Answer 27

Has the shortest wave length and travels super fast

Question 28

red

Answer 28

has the longest wavelength and is slow

Question 29

What happens when light passes through a dense object

Answer 29

It forms a rainbow after leaving the dense medium.

Question 30

1. Cornea

Answer 30

clear window that refracts light, it also helps focus it

Question 31

2. pupil

Answer 31

hole in the iris allows light to come in

Question 32

3. iris

Answer 32

coloured, changes size to control the amount of light that enters.

Question 33

4. lense

Answer 33

refracts light to focus the image

Question 34

5. retina

Answer 34

light-sensitive cells

Question 35

6. optical nerve

Answer 35

takes messages from the retina to the brain

Question 36

7. sclera

Answer 36

white tough outer layer that protects the eye

Question 37

8. liquid humor

Answer 37

water at the front, jelly at the back helps the ye hold shape

Question 38

Rods

Answer 38

sensitive to light and dark, shape and movement

Question 39

Cones

Answer 39

arent sensitive but are reactive to one of the primary colours