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Light intensity used to be measured according to this
candle
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These materials allow some light to pass through them
translucent
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The name given to a picture cut from black card to look like a shadow
Silhouette
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Sunglasses are made of this type of glass
Tinted
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A light source you may need to put cells in
Torch
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Our most important light source
Sun
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An opaque object does this to light and cause a shadow to form
block
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This has to be transparent so that light can enter the room
window
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A material that will not allow any light pass through it
opaque
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