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Anonymous users2024-01-24"Cat's eye" is made up of a combination 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 "cat's eye" of the security door is equivalent to a concave lens, and the concave lens has a divergent effect on light
The gap is fitted with a (concave lens) on the (outside) where the lens is in >>>More
That's right, I think it should be junior high school physics, using the principle of convex lens imaging.
The pattern on the security door is an eye, which means that if somebody rings the doorbell, look through the cat's eye on the security door and see if it's a good guy or a bad guy.
From the use of "cat's eye", it can be seen that people's outdoor eyes can not see the indoor scenery clearly whether they are close to or far from the "cat's eye", and people can clearly see outdoor people and scenery when they are close to or far away from the "cat's eye", and the eyes are close to the "cat's eye" to observe the scenery better. What I saw was an upright virtual image of the scene, like a slight correction than the scene The cat's eye is composed of two lenses, the object.
It's used to ring the doorbell!!