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Anonymous users2024-01-24Concave mirrors.
Because, the role of the cat's eye is to use a smaller hole to see a larger range, the flat mirror does not have this effect, and the convex lens will produce a magnifying effect, the image is large, the range is also large, where you can't see a larger range, only the concave mirror has a narrowing effect, the image is small, and the range of seeing is also large.
Have you ever noticed that when you look at the cat's eye, you feel that the person you see is far away, this is the shrinking effect of the concave mirror.
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Anonymous users2024-01-23There are both convex and concave lenses, which are the principles of telescopes, but they are used in reverse.
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Anonymous users2024-01-22A cat's eye (door mirror) is a combination of two lenses (a convex lens and a concave mirror) when we exit the door.
When looking inside and out, the objective lens is a concave lens and the eyepiece is a convex lens. The focal length of the objective lens is very short, and it turns the outdoor person or object into a very small upright virtual image, which falls exactly in the first focus of the eyepiece, and the eyepiece plays the role of a magnifying glass, and finally obtains a more magnified upright virtual image.
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Anonymous users2024-01-21Wealth + Experience) + 15 minutes to answer the prize.
The "cat's eye" is composed of a concave lens and a convex lens, the objective lens is a concave lens, and the eyepiece is a convex lens, but the focal length of the objective lens is shorter, the focal distance of the eyepiece is longer, and the focal length of the eyepiece should be equal to or greater than the distance between the objective lens and the eyepiece (the length of the cat's eye) and the sum of the focal length of the eyepiece, so that when people look from the inside of the door, they can clearly see the situation outside, and when they look from the outside to the inside, they will not see anything.
The eye can see bai into a special and precise DU optics. >>>More
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Concave lenses. The concave lens is a virtual image with upright and shrinking regardless of the distance. It is mounted on the outside of the door. >>>More
Add a cat's eye cover to the room.