P14 - Light 2️⃣✅

Question 1

What is a plane mirror?

Answer 1

One that is straight and not curved

Question 2

What is the angle of incidence?

Answer 2

The angle between the incident ray and the normal line

Question 3

What is the angle of refraction?

Answer 3

The angle between the refracted ray and the normal

Question 4

What is a concave lens?

Answer 4

A lens that diverges rays outwards

Question 5

What 3 key words would discribe an image produced by a concave lens?

Answer 5

• Virtual
• Upright
• Enlarged

Question 6

What is a convex lens?

Answer 6

A lens that converges rays onto one focal point

Question 7

What 3 key words would discirbe an image produced by a convex lens?

Answer 7

• Real
• Inverted
• Diminished

Question 8

What are common uses for concave lenses?

Answer 8

• Binoculars
• Glasses ( myopia)

Question 9

What is a common uses for convex lenses?

Answer 9

• Glasses (Hyperopia)

Question 10

What is diffuse relfection?

Answer 10

A reflection of a ray from a rough surface and therefore the light rays are scattered in differnet directions

Question 11

What is specular reflection?

Answer 11

A reflection of a ray from a smooth surface and therefore each light ray is reflected in the same, single direction

Question 12

What is focal length?

Answer 12

The distance from the centre of a lens to the point where light rays parallel to the prinicpal axis are foucsed/ appear to diverge from

Question 13

What is the equation for magnification?

Answer 13

Magnification = Image height ÷ object height (IAM TRIANGLE)

Question 14

What is the normal line?

Answer 14

A straight line through a surface or boundary perpendicular to the surface or boundary

Question 15

What does it mean when an object is opaque?

Answer 15

That light cannot pass through it

Question 16

What does it mean when an object is transluscent?

Answer 16

That some light can pass through it

Question 17

What does it mean when an object is transparent?

Answer 17

All light can pass through it

Question 18

List the 3 pirmary colours of light

Answer 18

• Red
• Blue
• Green

Question 19

List the 4 secondary colours of light

Answer 19

• Cyan
• Magenta
• Yellow
• White

Question 20

How do objects appear coloured?

Answer 20

Certain objects reflect only certain colours of light and will absorb all the other colours. e.g. Grass is green because it reflects green light and absorbs all the other colours on the spectrum

Question 21

What does it mean in terms of light when an object appears black?

Answer 21

That it absorbs all the colours on the spectrum

Question 22

What does it mean in terms of light when an objects appears white?

Answer 22

That it reflects all the colours on the spectrum

Question 23

What is a real image?

Answer 23

An image formed when real light rays corss that can therefore also pe projected

Question 24

What is a virtual image?

Answer 24

An image formed when ‘fake rays’ are etrapolated backwards and therefore cross. Because they are not real rays and dont actually ever cross, the image cannot be projected onto a screen

Question 25

Order how you would draw a ray diagram for a convex lens

Answer 25

• 4
• 5
• 1
• 3
• 2

Question 26

What is refraction?

Answer 26

When a wave changes direction due to a change in speed when meetign a boundary at an angle

Question 27

What do you do differently when drawing a ray diagram for a concave lens?

Answer 27

After drawing in the rays through the centre of the lens and parallel to the principle axis until the lens - you would take the parallel ray and extrapolate it backwards by joining it back wards to the focal point that would be on the left of the lens by the image. Where this newly drawn line meets the ray that goes through the middle of the lens is where the virtual image would be formed.

Question 28

What type of wave are electromagnetic waves?

Answer 28

Transverse, so travel perpendiular to the direction in which the wave transfers energy

Question 29

What is a Charge Coupled Device (CCD)?

Answer 29

A charged coupled device (CCD) absorbs infrared radiation to produce an image. Each pixel in the CCD detects the infrared radiation and the data can be processed using a computer.

Question 30

What is another word for a convex lens?

Answer 30

A converging lens

Question 31

What is another word for a concave lens?

Answer 31

A diverging lens

Question 32

What lens is this the short hand symbol for?

Answer 32

A convex lens (converging)

Question 33

What lens is this the short hand symbol for?

Answer 33

A concave lens (diverging)

Question 34

Label this ray diagram for a refracted ray

Answer 34

Question 35

If a light ray enters a more dense medium as it refracts it will bend ____________ the normal

Answer 35

If a light ray enters a more dense medium as it refracts it will bend towards the normal

Question 36

If a light ray enters a less dense medium as it refracts it will bend ____________ the normal

Answer 36

If a light ray enters a less dense medium as it refracts it will bend away from the normal