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 chemistry learning and experiment kit comes with components and chemicals for over 75 amazing experiments!
This microscope is so versatile you can even take it with you on a job site!
This project book and sample kit introduces you to shape-memory alloy technology!
This mirascope creates a 3D hologram image!
Illuminate both your room and your mind with this ingenious Periodic Table Lamp.
NEW 2016 DESIGN! This hip red tee features Pi to 1000 decimal places on an ultra soft 100% cotton shirt.