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Physics > Light > Flashcards

Light Flashcards

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1
Q

Energy

A

Is the ability to do work i.e. Move. Unit of energy is the joule

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2
Q

Plants use of light

A

To make food (photosynthesis)
Photo- light
Synthesis- to make

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3
Q

Human use of light

A

Solar panels

Crooke’s radiometer

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4
Q

Luminous

A

Objects that give off light

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5
Q

Non luminous

A

Objects that do not give off light, and need light to bounce off them for us to see them

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6
Q

Light

A

Is a form of energy

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7
Q

Light travels in straight lines

A

We can show this by blocking light from a bulb with card

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8
Q

Light does not travel around corners

A

Blocking light leads to shadows

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9
Q

Solar eclipse

A

Occurs when the moon passes between the sun and the earth

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10
Q

Lunar eclipse

A

Occurs when the earth is between the sun and the moon, the moon is in the earths shadow.

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11
Q

Reflection of light

A

Occurs when it bounces off a surface

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12
Q

Regular reflection

A

Shiny smooth surface, the Rays are reflected back at the same angle

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13
Q

Irregular reflection

A

Rough surface e.g. A ball of tinfoil

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14
Q

Concave or diverging mirrors

A

Telescopes, makeup,shaving, can enlarge the image

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15
Q

Convex or converging mirrors

A

Side mirror in cars, security mirrors in shops

Small, upright image with a wider field of vision

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16
Q

Refraction

A

The bending on light as it goes from one medium to another e.g. Air to water.
Lights rays are refracted towards the denser material

17
Q

Convex or converging lens

A

Used to bring rays together

Used to fix long sightedness, or hypermetropia

18
Q

Concave or diverging lens

A

Used to spread Rays apart

Used to fix short sightedness, or myopia

19
Q

Whit light

A

Not really white, is a mixture of the 7 colours of the spectrum

20
Q

Dispersion

A

Is the splitting of white light into its constituent colours due to refraction

Physics (8 decks)

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