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Physics > Light > Flashcards

Light Flashcards

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1
Q

Energy

A

Is the ability of work unit of energy is the joule

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2
Q

Plants use of light

A

To make food ( photosynthesis)

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3
Q

Human use of light

A

Solar panels

Crookes radiometer

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4
Q

Luminous

A

Objects that give off light are called luminous objects e.g. the sun lightbulb candle

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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 are called non luminous e.g book people chair

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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

A solar eclipse occurs when the moon passes between the sun a and the earth

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10
Q

Lunar eclipse

A

A lunar eclipse 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 e.g mirror

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, make up, and shaving mirrors

Can enlarge the image

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15
Q

Convex or converging mirrors

A

Side mirrors 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 of 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

White light

A

White light is not really white

It is a mixture of the 7 colours of the spectrum

20
Q

Dispersion

A

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

Physics (11 decks)

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