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jan test > light > Flashcards

light Flashcards

1
Q

absorb

A

Taken into a material.

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2
Q

angle of incidence

A

The angle between the incident ray and the normal line.

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3
Q

angle of reflection

A

The angle between the reflected ray and the normal line.

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4
Q

brain

A

The organ in the human body that processes signals from receptors.

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5
Q

charge-coupled device (CCD)

A

A grid of pixels at the back of a digital camera that absorbs light and produces an image.

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6
Q

continuous

A

A variable that has values that can be any number.

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7
Q

converging

A

Bringing rays of light together.

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8
Q

convex

A

A lens that produces converging rays of light.

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9
Q

cornea

A

The transparent layer at the front of the eye.

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10
Q

diffuse reflection

A

Reflection from a rough surface.

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11
Q

dispersion

A

The splitting up of a ray of light of mixed wavelengths by refraction into its components.

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12
Q

emit

A

To give out.

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13
Q

endoscope

A

A medical instrument for seeing inside the human body.

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14
Q

eye

A

Organ of sight, which focuses and detects light.

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15
Q

filter

A

A piece of material that allows some radiation (colours) through but absorbs the rest.

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16
Q

focal point

A

The point at which the rays refracted by a convex lens cross over.

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17
Q

focus

A

Another name for the focal point.

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18
Q

frequency

A

The number of complete waves or vibrations produced in one second (measured in hertz).

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19
Q

image

A

The point from which rays of light entering the eye appear to have originated.

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20
Q

incident ray

A

The ray coming from a source of light.

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21
Q

inverted

A

Upside down.

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22
Q

iris

A

The coloured part of your eye

23
Q

law of reflection

A

The angle of incidence is equal to the angle of reflection.

24
Q

lens

A

A device made of shaped glass that focuses light rays from objects to form an image.

25
Q

light-time

A

Distance measured in terms of how far light travels in a given time.

26
Q

luminous

A

Gives out light.

27
Q

medium

A

The material that affects light or sound by slowing it down or transferring the wave.

28
Q

non-luminous

A

Objects that produce no light.

29
Q

normal

A

An imaginary line at right angles to a surface where a light ray strikes it.

30
Q

opaque

A

Objects that absorb, scatter, or reflect light and do not allow any light to pass through.

31
Q

optic nerve

A

A paired sensory nerve that runs from each eye to the brain.,

32
Q

photoreceptors

A

Specialised cells that are sensitive to light.

33
Q

pinhole camera

A

A simple camera made of a box with a small hole at the front and a screen at the back.

34
Q

pixel

A

A picture element found at the back of a digital camera.

35
Q

plane

A

A mirror with a flat, reflective surface.

36
Q

primary colour

A

The colours red, blue, and green.

37
Q

prism

A

A triangular-shaped piece of glass used to produce a spectrum of light.

38
Q

pupil

A

The hole in the front of your eye where light goes in.

39
Q

real (image)

A

An image that you can put on a screen; the image formed in your eyes.

40
Q

reflect

A

Bounce off.

41
Q

reflected ray

A

The ray that is reflected from a surface.

42
Q

refraction

A

The change in direction of a ray or wave as a result of its change in speed.

43
Q

retina

A

The layer of light sensitive cells at the back of the eye.

44
Q

secondary colour

A

Colours that can be obtained by mixing two primary colours.

45
Q

source

A

Things that emit (give out) light or sound.

46
Q

spectrum

A

A band of colours produced when light is spread out by a prism.

47
Q

specular reflection

A

Reflection from a smooth surface.

48
Q

translucent

A

Objects that transmit light but diffusing (scattering) the light as it passes through.

49
Q

transmit

A

When light or other radiation passes through an object.

50
Q

transparent

A

Objects that transmit light and you can see through them.

51
Q

vacuum

A

A space in which there is no matter.

52
Q

virtual

A

An image that cannot be focused onto a screen.

53
Q

wave

A

A vibration that transfers energy.

jan test (10 decks)

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