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5
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candles, matches and electric lamps are an example of _____________ light.
ARTIFICIAL
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produce and emit natural light. Their bodies have luciferin, a chemical the causes them to appear luminous.
FIREFLIES
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a transparent optical element with flat and polished surfaces that disperse light.
Prism
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heart
Other team wins 5 points!
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rocket
Go to first place!
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fairy
Take points!
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25
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lifesaver
Give 15 points!
Oops!
5
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luciferin is a chemical that causes fireflies to appear luminous. This source of light is called
bioluminescent source
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heart
Other team wins 25 points!
Oops!
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star
Double points!
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fairy
Take points!
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25
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baam
Lose 25 points!
Oops!
5
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ray of light that hits a surface
Incident ray
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formed when an opaque object blocks the light of another object.
Shadow
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Objects that produce unnatural light.
ARTIFICIAL SOURCE OF LIGHT
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objects that allow light to pass through them
Transparent object
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Primary source of natural light on Earth.
SUN
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is the angle between the incident ray and the normal.
Angle of Incidence
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do not allow any light to pass through them.
Opaque
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a nonluminous sources
MOON
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5
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why does the flash lightning appears before the roar of thunder is heard?
BECAUSE THE LIGHT TRAVELS FASTER THAN THE SOUND.
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baam
Lose 25 points!
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gift
Win 20 points!
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fairy
Take points!
5
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15
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25
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thief
Give points!
5
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25
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