Light

Question 1

What do solar panels do?

Answer 1

convert light energy to heat energy

Question 2

Give an example of something that converts:
light energy to heat energy
light energy to chemical energy

Answer 2

solar panels

photosynthesis

Question 3

what can light do?

Answer 3

work

Question 4

what does crooke’s radiometer show?

Answer 4

that light can do work

Question 5

what happens when the vanes move in crooke’s radiometer?

Answer 5

light energy is converted to kinetic energy

Question 6

what do our eyes do?

Answer 6

detect light

Question 7

give an example of 1. luminous objects

2. non-luminous objects

Answer 7

1. Sun, fire, lightbulb

2. Table, chair, door

Question 8

What is a luminous object?

Answer 8

An object that gives out light

Question 9

what is a non-luminous object?

Answer 9

an object that reflects light (it does not give out light)

Question 10

how does light travel?

Answer 10

in straight lines

Question 11

do experiment to show light travels in straight lines

Answer 11

.

Question 12

how are shadows formed?

Answer 12

When light rays are stopped by an object

Question 13

When does a solar eclipse occur?

Answer 13

when the moon passes between the sun and the earth

Question 14

What is the spectrum of light made up of?

Answer 14

7 colours
red, orange, yellow, green, blue, indigo and violet
richard, of, york, gave, battle, in, vain

Question 15

what is dispersion?

Answer 15

the breaking up of white light into it’s spectrum of colours

Question 16

how do we show that white light is made up of different colours?

Answer 16

we pass white light through a prism

Question 17

when does a rainbow occur?

Answer 17

when light from the sun passes through raindrops

Question 18

what is reflection?

Answer 18

when light bounces off a surface

Question 19

what angle does light get reflected back at

Answer 19

the same angle as it struck

Question 20

do the reflection experiment

Answer 20

.

Question 21

what angle do the mirrors need to be at in a periscope if it is to work?

Answer 21

45*

Question 22

What is a periscope?

Answer 22

An optical instrument that provides a view of an otherwise obstructed field using two mirrors at 45* angles reflecting light.

Question 23

what is refraction?

Answer 23

the bending of light

Question 24

how can refraction happen?

Answer 24

when light is passed through a solid or a liquid

Question 25

what is seen to happen to light as it goes from the air into a glass block

Answer 25

change direction/bend

Question 26

write out the refraction experiment

Answer 26

.

Question 27

what is a focal point?

Answer 27

a point where light converges on or diperses from

Question 28

what is a convex lens shaped like?

Answer 28

an oval

Question 29

what is a concaved lens shaped like?

Answer 29

a rectangle with half an oval taken out of either side

Question 30

what happens when light passes through a convex lens?

Answer 30

it comes together

Question 31

what happens if you look at something through a convex lens?

Answer 31

it makes it look bigger

Question 32

give an example of convex lenses

Answer 32

magnifying glass and glasses (for far away)

Question 33

what happens when light passes through a concave lens?

Answer 33

it disperses

Question 34

What happens when you look at something through a concave lens?

Answer 34

it appears smaller

Question 35

give an example of a concaved lens

Answer 35

in reading glasses

Question 36

What is light?

Answer 36

light is a form of energy