P1 - Topic 1 - Reflection And Refraction / Lenses / Telescopes

Question 1

How can waves be reflected?

Answer 1

When a wave hits a boundary between one medium and another, some of the energy is reflected

Question 2

Why can you sometimes see your reflection in puddles?

Answer 2

Light is reflected back at you

Question 3

The angle of reflection is the same as what other angle?

Answer 3

The angle of incidence

Question 4

‘r’ represents what angle?

Answer 4

Angle of reflection

Question 5

‘i’ represents what angle?

Answer 5

The angle of incidence

Question 6

Waves can’t be reflected. True or false?

Answer 6

False - they can be reflected

Question 7

Why is the light reflected?

Answer 7

Because of the change in density, whenever a wave reached a medium with a different density, some of the wave is reflected at the boundary

Question 8

Do waves travel at the same speed or different speed in substance which have different densities?

Answer 8

Different speeds

Question 9

In denser media do EM waves usually travel slower or faster?

Answer 9

Slower

Question 10

Do sound waves travel faster in denser substances?

Answer 10

Yes

Question 11

What happens when a wave crosses a boundary between two substances (from glass to air) ?

Answer 11

It changes speed

Question 12

If a wave hits the boundary face on what happens?

Answer 12

It slows down but carries on on the same direction

Question 13

If a wave meets a different medium at an angle what happens?

Answer 13

That part of the wave huts the denser layer first and slows down while he the other part carries km at the first, faster speed which causes the ace to change direction

Question 14

If light is passim from the air into the glass (a denser medium) what cause the light Ray to bend towards the medium?

Answer 14

When the light transfers from the air to the glass it slows down causing It to refract

Question 15

When does the light bend away from the normal?

Answer 15

When the light reaches the glass to air boundary on the other side of the a down its passing into a less dense medium so it speeds up and bends away from the normal

Question 16

What kind of Mage is actually there and wha kind of image is not actually there

Answer 16

Real image = actually there

Virtual image = not actually there

Question 17

What is a real image?

Answer 17

It is where the light from an object comes together to form an image on a ‘screen’

Question 18

What is a virtual image?

Answer 18

It is when the Rays are diverging so the light from the object appears to be coming from a completely different place

Question 19

When you look in the mirror do you see a real or virtual image and why?

Answer 19

Virtual image of your face because the object appears to be behind the mirror

Question 20

When you look at an object through a magnifying lens why do you see a virtual image?

Answer 20

The image looks bigger and further away than the object actually is

Question 21

What are converging lenses used for?

Answer 21

To focus light

Question 22

What does a converging lens cause parallel Ray’s of light to do?

Answer 22

Converge (move to) a focus

Question 23

What is the line called that passes through the middle of lens

Answer 23

The axis of the lens

Question 24

What is the focal point?

Answer 24

Where the Rays hitting the lens parallel to the axis meet

Question 25

Each lens has a focal point where?

Answer 25

In front and the las and one behind

Question 26

What is the focal length?

Answer 26

The distance from the lens to its focal point

Question 27

What lenses does a refraction telescope use?

Answer 27

Two converging lenses

Question 28

What two converging lenses is a refracting telescope made up of?

Answer 28

An objective lens and an eyepiece lens

Question 29

Do refracting telescopes form virtual or real images?

Answer 29

Real images