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This self-contained unit allows students to measure and study refraction of
light. The angle of incident and refractive rays are easily seen with the
help of a built-in laser as its light source. The laser revolves around the
circular graduated scale and can be set at any point. Students can easily
observe light rays as they travel from air into water, water into air, and
water into water. Includes leveling screws to level the water in the tank.
Circular scale is 6-3/8" diameter.
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