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

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