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Science > Physics Unit test > Flashcards

Physics Unit test Flashcards

1
Q

What is the normal?

A

Line perpendicular to a mirror surface

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2
Q

What is a mirror made of?

A

Silver and glass

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3
Q

What are the rules of refraction?

A

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.

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4
Q

What are the laws of reflection?

A

The angle of incidence equals the angle of reflection

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

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5
Q

What is the salt for a plane mirror?

A

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

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6
Q

What are the four rules of reflection?

A

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

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7
Q

What is a concave mirror used for?

A

Makeup

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8
Q

What is a convex mirror used for?

A

Turning corners in hospitals, car

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9
Q

Draw a concave mirror diagram

A

Now

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10
Q

Draw a convex mirror diagram

A

Go

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11
Q

Convex mirror diagram SALT

A

Smaller
Upright
Between v and f (behind mirror)
Virtual

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12
Q

Concave mirror SALT

A

20 in notes

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13
Q

What is refraction?

A

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

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14
Q

When light slows down it bends From the normal

A

Towards

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15
Q

When light speeds up it bends From the normal

A

Away

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16
Q

Refraction diagram

Note 32

A

Keep going!

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17
Q

Medium 1: 49*
Medium 2: 20*

Which is more dense?
Speeding up or slowing down?

A

Slowing down

Medium 2

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18
Q

How do fish in ponds appear? Why?

A

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

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19
Q

How do you calculate the index of refraction?

A

Use the formula n= c divided by v

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20
Q

What is the v in the formula?

A

The speed of light in the substance

21
Q

What is “c” in the formula?

A

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

22
Q

Index of refraction problems

A

34 of notes

23
Q

What are some applications of refraction?

A

Spear fishing
Sunrise/set
Heat waves

24
Q

What are the two conditions for TIR?

A

Light must travel from a more to less optically dense material

The angle of incidence must be greater than the critical angle

25
Q

What is the critical angle?

A

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

26
Q

How does TIR work?

A

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

27
Q

Critical angle questions

A

Note 41

28
Q

Applications of TIR

A

Mirages note 42
Diamonds
Rainbows
Prisms

29
Q

How do you calculate magnification?

A

M=hi/ho

30
Q

Converging lenses object locations

A

Note 45

31
Q

What device uses a lens to produce a real image?

A

Glasses, contacts

32
Q

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

A

Magnifying glass

33
Q

In converging lenses, where is the object always located?

A

On the side of F prime

34
Q

What are the rules for a converging lens?

A

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

35
Q

In diverging lenses, where is the object always located?

A

On the same side as F

36
Q

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

A

The focal length is negative

37
Q

What are the rules for diverging lenses?

A

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

38
Q

What happens when you cover half of the object?

A

The image is also cut in half

39
Q

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

A

It is still there but appears dimmer

40
Q

Eye parts and functions

A

Note 51 and 55

41
Q

What is a diverging lens used for?

A

To correct nearsightedness. People who can’t read far

42
Q

What are converging lenses used for?

A

They correct farsightedness. People who cannot see close things

43
Q

Where does a far away image focus in nearsightedness?

A

The image is focused too soon so the picture is blurry

44
Q

Where do farsighted people focus on close objects?

A

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

45
Q

What is nearsightedness?

A

Myopia

46
Q

What is farsightedness?

A

Hypermetropia

47
Q

When is there no image in a concave mirror?

A

When the object is on F

48
Q

be able to label an eye

A

almost there

Science (8 decks)

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