Physics Unit test

Question 1

What is the normal?

Answer 1

Line perpendicular to a mirror surface

Question 2

What is a mirror made of?

Answer 2

Silver and glass

Question 3

What are the rules of refraction?

Answer 3

The incident Ray, refracts Ray and normal all lie on the same plane

Light bends towards the normal when the speed of light in medium 2 is slower than the first.

Light bends away from the normal when the speed of light in the second medium is faster than the first.

Question 4

What are the laws of reflection?

Answer 4

The angle of incidence equals the angle of reflection

The incident Ray, the reflected Ray, and the normal all lie on the same plane.

Question 5

What is the salt for a plane mirror?

Answer 5

Size: the same size as object
Attitude upright
Location: same distance “behind mirrors”
Type: virtual

Question 6

What are the four rules of reflection?

Answer 6

A light Ray parallel to the principal axis is reflected through the focus

A light Ray through the focus reflects parallel to the principal axis

A light Ray through the centre of curvature is reflected back on the same line

A light Ray through the vertex is reflected at the same angle

Question 7

What is a concave mirror used for?

Answer 7

Makeup

Question 8

What is a convex mirror used for?

Answer 8

Turning corners in hospitals, car

Question 9

Draw a concave mirror diagram

Answer 9

Now

Question 10

Draw a convex mirror diagram

Answer 10

Go

Question 11

Convex mirror diagram SALT

Answer 11

Smaller
Upright
Between v and f (behind mirror)
Virtual

Question 12

Concave mirror SALT

Answer 12

20 in notes

Question 13

What is refraction?

Answer 13

The bending of light due to a change of optical density.

Question 14

When light slows down it bends From the normal

Answer 14

Towards

Question 15

When light speeds up it bends From the normal

Answer 15

Away

Question 16

Refraction diagram

Note 32

Answer 16

Keep going!

Question 17

Medium 1: 49*
Medium 2: 20*

Which is more dense?
Speeding up or slowing down?

Answer 17

Slowing down

Medium 2

Question 18

How do fish in ponds appear? Why?

Answer 18

Shallower because the light is refracted through the water which is more optically dense than air

Question 19

How do you calculate the index of refraction?

Answer 19

Use the formula n= c divided by v

Question 20

What is the v in the formula?

Answer 20

The speed of light in the substance

Question 21

What is “c” in the formula?

Answer 21

The speed of light in a vacuum 3.0x10^8 m/s

Question 22

Index of refraction problems

Answer 22

34 of notes

Question 23

What are some applications of refraction?

Answer 23

Spear fishing
Sunrise/set
Heat waves

Question 24

What are the two conditions for TIR?

Answer 24

Light must travel from a more to less optically dense material

The angle of incidence must be greater than the critical angle

Question 25

What is the critical angle?

Answer 25

The angle at which the light neither refracts nor reflects internally. There is no light beam

Question 26

How does TIR work?

Answer 26

As angle i increases angle R does too. Angle R then starts to run out of room causing this to be a critical angle.

Question 27

Critical angle questions

Answer 27

Note 41

Question 28

Applications of TIR

Answer 28

Mirages note 42 Diamonds Rainbows Prisms

Question 29

How do you calculate magnification?

Answer 29

M=hi/ho

Question 30

Converging lenses object locations

Answer 30

Note 45

Question 31

What device uses a lens to produce a real image?

Answer 31

Glasses, contacts

Question 32

What device uses a lens to produce a larger virtual image?

Answer 32

Magnifying glass

Question 33

In converging lenses, where is the object always located?

Answer 33

On the side of F prime

Question 34

What are the rules for a converging lens?

Answer 34

A light Ray parallel to the principle axis refracts through the principal focus A light Ray that passes through F prime refracts parallel to the principal axis A light Ray that passes through the optical centre goes straight through

Question 35

In diverging lenses, where is the object always located?

Answer 35

On the same side as F

Question 36

How can you tell a problem is talking about a diverging lens?

Answer 36

The focal length is negative

Question 37

What are the rules for diverging lenses?

Answer 37

A light Ray parallel to the principle axis refracts in line with the principal focus A light Ray that is aimed toward the secondary principal focus refracts parallel to the PA A light Ray through the optical centre goes straight through without refracting

Question 38

What happens when you cover half of the object?

Answer 38

The image is also cut in half

Question 39

What happens to the image when you cover half of the lens?

Answer 39

It is still there but appears dimmer

Question 40

Eye parts and functions

Answer 40

Note 51 and 55

Question 41

What is a diverging lens used for?

Answer 41

To correct nearsightedness. People who can't read far

Question 42

What are converging lenses used for?

Answer 42

They correct farsightedness. People who cannot see close things

Question 43

Where does a far away image focus in nearsightedness?

Answer 43

The image is focused too soon so the picture is blurry

Question 44

Where do farsighted people focus on close objects?

Answer 44

Too far behind the eye. The lens cannot bend the light enough to converge the light rays.

Question 45

What is nearsightedness?

Answer 45

Myopia

Question 46

What is farsightedness?

Answer 46

Hypermetropia

Question 47

When is there no image in a concave mirror?

Answer 47

When the object is on F

Question 48

be able to label an eye

Answer 48

almost there