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Science Y8 > Light > Flashcards

Light Flashcards

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1
Q

What is light?

A

A form of energy

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2
Q

What type of waves are light waves?

A

Transverse waves

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3
Q

True or false: light travels in straight lines

A

True

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4
Q

At what speed does light travel?

A

300,000,000 m/s

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5
Q

What is a luminous object?

A

An object that emits light.

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6
Q

How do we see luminous objects?

A

The light from these objects enters the eyes.

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7
Q

What is a non-luminous object?

A

An object that does not emit light.

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8
Q

How do we see non-luminous objects?

A

Non-luminous objects reflect the light from luminous objects into the eyes.

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9
Q

Define transparent:

A

allows light to pass through

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10
Q

What is it called when an object allows some light to pass through?

A

Translucent

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11
Q

Define opaque:

A

Allows no light to pass through

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12
Q

What are the 4 rules for drawing ray diagrams?

A

The lines must be: straight, touch the objects, have arrows showing the direction of travel and reflected rays must join up with each other.

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13
Q

Define specular reflection:

A

when each light ray is reflected at the same angle. The AoI = AoR

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14
Q

Define diffuse reflection:

A

The reflected rays come back at different angles and in different directions.

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15
Q

Is a mirror an example of specular or diffuse reflection?

A

Specular

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16
Q

Is paper an example of specular or diffuse reflection?

A

Diffuse.

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17
Q

Follow this link and correctly label the ray diagram: https://qph.fs.quoracdn.net/main-qimg-d46c2b33dfc74b08ec8536db6d17cc9b

A

A= Incident Ray. A’= Reflected Ray. N= Normal. P= angle of incidence. Q= angle of reflection

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18
Q

What is the Incident Ray?

A

The light ray that comes from the light source and hits the object.

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19
Q

What is the Reflected Ray?

A

The light ray that bounces off of a surface and into the eyes

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20
Q

What is the Normal Line?

A

A line at 90 degrees, perpendicular to the mirror

21
Q

How are periscopes made?

A

By positioning two mirrors at 45 degrees to each other in a tube.

22
Q

What happens when light moves from a more or less dense transparent medium?

A

Refraction

23
Q

True or false: light bends as it moves from a more or less dense medium

A

True

24
Q

True or false: light waves do not change speed when they move from one medium to another

A

False

25
Q

If light goes from a LESS dense medium –> MORE dense medium, will it bend towards or away from the normal?

A

towards

26
Q

If light goes from a MORE dense medium –> LESS dense medium, will it bend towards or away from the normal?

A

Away

27
Q

Give an example of dispersion:

A

white light entering a water droplet/prism is refracted into a separate spectrum of light waves

28
Q

True or false: different colours refract more or less when passing through prisms and droplets.

A

true

29
Q

Which colour is refracted the most?

A

Violet

30
Q

Which colour is refracted the least?

A

Red

31
Q

Objects that look white ____ all colours of the spectrum.

A

Reflect

32
Q

Objects that look black ____ all colours of the spectrum.

A

Absorb

33
Q

Explain why a red bottle would look red.

A

A red object only reflects red light and absorbs all other colours.

34
Q

What happens when white light passes through a filter?

A

Only the colour of the filter can pass through and all other colours are absorbed.

35
Q

What are the colours in a light spectrum?

A 
Richard  -  Red
Of           -  Orange
York        - Yellow
Gave       - Green
Battle      - Blue
In             - Indigo
Velvet     - Violet
36
Q

Do pinhole cameras have a lens?

A

No

37
Q

What do pinhole cameras have instead of a lens?

A

A tiny hole.

38
Q

How many light rays from each point of the object enters a pinhole camera?

A

1

39
Q

How do pinhole cameras work?

A

1 light ray from each point on the objects enters the camera (travelling in a straight line), and inside they cross over, so the image is seen upside down.

40
Q

Label the this diagram : https://i.pinimg.com/236x/4b/39/25/4b39250884cd07e52eabdd94ce95f4cc–physics-revision-th-grade-science.jpg

A 
1 - Cornea
2 - Pupil
3 - Iris
4 - Lens
5 - Retina
6 - Ciliary Muscle
7 - Optic Nerve
41
Q

What is the function of the iris?

A

The coloured part of the eye and controls the amount of light which enters the eye.

42
Q

What is the function of the cornea?

A

A transparent layer at the front of the eye and focuses much of the light entering the eye.

43
Q

Are the cornea and lens convex or concave?

A

Convex

44
Q

What is the function of the ciliary muscle?

A

Changes the lens shape for focusing.

45
Q

What is the function of the pupil?

A

The hole where the light enters the eye.

46
Q

What is the name of the photo-sensitive cells at the back of the eye?

A

Retina

47
Q

What is the nerve that runs from the eye to the brain?

A

The optic nerve.

48
Q

How is the eye similar to the pinhole camera?

A

The light crosses over inside so the image is formed inverted.

49
Q

What is an absorber?

A

Anything that absorbs light.

Science Y8 (15 decks)

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