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start learning

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

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