The cat s eye of the security door, can people outside see the indoor through the cat s eye?

You can see a little bit of a small area, and you can make a lid for the interior and usually block it.

No.. It's very vague. Can't see clearly.

Generally, it is not visible, and even if it is visible, it is a small area of vision.

No, because the cat's eye is made up of a concave lens and a convex lens. The focal length of the concave lens is extremely short, it makes the person or object outside the door into an upright and shrinking virtual image, this image just falls within the focus of the eyepiece, and finally obtains an enlarged upright virtual image, which is just near the bright vision distance of the human eye, and the situation outside the door can be seen clearly.

No, I tried. It's too far. You can try.

Needless to say, I have one at home, I'll help you take a look, you wait.

Well. I can't see it, it's dark at night, and even if the light is strong indoors, I can only see a very faint light, which is very blurry.

There is plenty of light during the day, and it is even more difficult to see clearly, let alone see people.

I can't see it, who dares to pretend to see it? Isn't that the same as making a hole in your own home for people to peek into?

Yes, but the indoor area is relatively small.

You can only see the light inside, but you can't see clearly, it's very blurry.

Basically not visible''It's very vague. ''I've tried it myself'''

Yes, but you can only know that there are objects, but you can't see them clearly.

I've tried so many times that I can't see it from the outside.

Seen a little, but very vague.