Do you think that the alarm cat s eye on the security door in the home is now a lens

That's right, I think it should be junior high school physics, using the principle of convex lens imaging.

The key to the anti-theft door at home is inserted in the door of the house, which is divided into two situations: first, the key is inserted on the door, and the key is directly unlocked and entered the house. Second, there is a key inserted in the door, and the key is locked in the house. >>>More

Method 2: If you want solid wood, you can find a brand, or you can make stairs, wooden doors or furniture processing factories in the local area, and there are generally stores in the building materials market. >>>More

The door mirror is made up of two lenses When we look out from the inside of the door, the objective lens is a concave lens, and the eyepiece is a convex lens Finally, we see the upright and shrunken image of the visitor So the role of the anti-theft door mirror is equivalent to a concave lens The concave lens has a divergent effect on light >>>More

Apply wind oil essence on the double-sided tape, after 10 to 15 minutes, after the wind oil essence has completely penetrated, gently rub it.