My lesson

 0    16 Datenblatt    moose63icebox
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echo
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reflected sound wave
longitudinal wave
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a wave in which particles move in the same direction as the wave
pitch
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perception of how high or low sounds seem
sound wave
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longitudinal wave that can travel only through matter
light ray
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narrow beam of light that travels in a straight line
light source
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something that emits light
opaque
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material through which light not pass
translucent
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allows most light to pass through but forms a blurry image
transparent
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allows almost all light to pass through and forms a clear image
convert
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to change from one form into another
cornea
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transparent tissue layer located on the outside of the eye
iris
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colored part of the eye
lens
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transparent object with at least one curved side that causes light to change direction
mirror
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any reflecting surface
pupil
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opening to the interior of the eye through which light enters
retina
sensitive cells in the back of the eye
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layer of light

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