描述
Traveling throught different medium causes a light ray to bend to different angles.
each transparent medium will speed up or slow down a light wave a different amount.
Snell’law states that the index of refraction of the first medium times the sine of the incident angle us equal to the index of refraction of the second medium times the the sine of the refraction angle
Many simple and useful devise are made from lenses. Place the arrow or F and lens to focus an image on the screen. then measuring the focal length
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