1: Light Flashcards

1
Q

Incandescent light source

A

Material emitting light when heated to a high temp (light bulb, wood)

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2
Q

Luminescent light source

A

Material emitting light by producing energy from a chemical reaction releasing little heat (fireflies, fish)

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3
Q

Fluorescent

A

Material emitting light by absoring high energy radiation (noble gasses: quantum energy)

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4
Q

Phosphorescent

A

Material absorbs and stores energy radiation to continue emitting when radiation removed (glow sticks)

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5
Q

Triboluminescence

A

Energy released from crushed/broken sugar crystals

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6
Q

Laser acronym

A

Light Amplification by Stimulated Energy Radiation

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7
Q

How do lasers work

A

Produce beams of photons all with same energy travelling in phase, producing fine and intense beams of light

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8
Q

3 ways light can propogate in media

A

Transparent (light goes through)
Translucent (diffused in many directions)
Opaque (light blocked)

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9
Q

How can media affect light’s passage

A

Reflect
Refract
Absorb

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10
Q

Light phenomena: reflection

A

Bounces off shiny material (mirror)

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11
Q

Light phenomena: refraction

A

Bends when change in media (air to water)

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12
Q

Light phenomena: dispersion

A

Splits into colours when passing through a prism (rainbow, oil)

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13
Q

Light phenomena: absorption

A

Light absorbed by object (black clothes)

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14
Q

Light phenomena: diffusion

A

Light spreads in many directions from a source (light bulb)

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15
Q

Light phenomena: diffraction

A

Light bends through small openings giving non uniform image

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16
Q

Point vs extended light source

A

Point: coming from one specific location
Extended: diametre of light source too large, seems like many point sources

17
Q

Umbra vs penumbra

A

Umbra: total darkness
Penumbra: partial darknesa