Your microwave window is a metal cage in disguise. 📡

Your microwave window is a metal cage in disguise. 📡 . . . Most ovens operate near 2.45 billion cycles per second, producing microwaves about 12 centimeters long. The door’s millimeter-scale holes are too small for that radiation to pass efficiently, but visible-light waves are thousands of times smaller. You see dinner; the microwaves see a wall.