Refraction Tank with Laser

The circular water tank is 12cm in diameter and the movable arm carrying the laser light source is parallel to the protractor disk.  This allows students to carefully measure the reflection and refraction angles, and internal reflection and refraction index.  The protractor disk and laser light attachment can be removed from the water tank and can be used for separate experiments.  Comes equipped with two mirrors and combines plane, concave and convex, a semi-circular lens, a bi-convex lens and a plano-convex lens.  Includes instruction manual and two AA batteries.