Optical Water Tank (Laser Refraction Tank with Laser)

200 ر.ق

The angle of incident and refractive rays are easily seen with the help of a built-in laser as its light source.

Add water up to the tank’s midline and create a surface that precisely transmits and reflects the laser beam for student observations.

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 the air, and water into water. The circular scale is 6-3/8″ in diameter.

You can also detach the apparatus from the tank to perform refraction and reflection experiments with the included prisms and mirrors!

Requires 2 AA batteries not included.

Availability: 100 in stock

  • Rotating laser for easy positioning
  • Demonstrate refraction and internal reflection
Use this sturdy, self-contained device to measure the refraction and incidence of light as well as the critical angle and total internal reflection. Simply fill the circular acrylic tank halfway with water and use the built-in laser, which can be rotated 360° around the tank, to direct a bright, narrow ray of light onto the water surface. The base contains 4 leveling screws to level the water in the tank. Appropriate for Grades 6-12. Requires (1) LR44 button battery (included).

The laser refraction tank consists of a laser (I suppose that part should be obvious) and a tank (which I suppose should also be at least as obvious). The tank has angle markings, as shown, and a hole on top so that it may be partially filled with a liquid.

If the tank is filled halfway with, say, water, then the plane to which all of the angles are measured becomes an interface between two regions of different indexes of refraction n. Air has an index of refraction close to n = 1 and water has an index of refraction of about n = 1.33, give or take a couple of hundredths based on temperature, pressure, fish poop, etc.. When the laser is shined in from above, it passes into a region of higher index of refraction at the interface, and thus the light bends toward the normal (imaginary line drawn perpendicular to the interface), as determined by Snell’s La:. n1sinθ1=n2sinθ2, where the angles θ1 and θ2 are measured with respect to the normal.


From beneath, the light bends away from the normal.

Light incident on a region of decreased index of refraction has another interesting consequence: it reflects. Since the light bends away from the normal as it passes into a region of lower index of refraction, it is easy to imagine a point where the refracted light will be exactly parallel to the surface of the water. But what happens if the laser is moved beyond that angle? At that point, it is impossible for any light to pass into the region of lower index of refraction because the angle is too steep, and thus we have total internal reflection.

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