Two 38 mm spherical lenses; one is a double concave, the other a double convex, each with a focal length of 150mm. When placed together the net focal length is zero. (1-1/2" x 1-1/2" x 1/4"; .005Ib).
Great for optics experiments in the lab or classroom.
This ultimate chemistry set features 250 mind-boggling experiments!
This smaller transportable Van de Graaff Generator will easily fit in any classroom!
This kit includes several different projects that demonstrate the power of magnets!
This glass Erlenmeyer mug makes an excellent gift!
Build a magnetic levitating train with this science fair project kit!
Great tarantula specimen for the science classroom!
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