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.
Discover how solar cells make electricity with this awesome kit!
Exciting magnet exploration for ages 8 and up!
This science kit is an essential introduction to physics knowledge!
Great microscope for viewing both slides and 3D objects such as flowers, bugs, rocks and more. Includes all accessories!
This quality Dobsonian style telescope features a 76 mm aperture reflector optical tube.
This classic desk toy will keep you amused!