Polaroid - Set of Two by labpro
Polaroid - Set of Two by labpro
Product Description:To demonstrate the principle of Polaroid Polarizer sheets are mounted in a circular plastic casing. The film on the upper casing can rotate. When the two sheets are at 90 degrees to each other you can see through but when they are parallel that is at 0 degrees they become opaque. 2.25"(60mm) dia x 1.5"(35mm) tall.
//