But sometimes, the target of the camera may not be a person, right? (forgive me if I ask a stupid question...)
So, will the camera detect other infrared radiation and focus wrongly?
Hi everyone,
An auto-focus camera emits an infrared pulse and detects the pulse reflected from the target, then it calculates the distance of that target from the camera (i.e. it can focus the target). As far as I know, all objects will emit infrared radiation, so what is the use of the pulse...
ah, I've met this picture before;
I want a picture that shows:
when an object is put at focal length of a convex lens, it gets refracted and becomes parallel. When an observer sees, these parallel rays will be converged by the eye lens onto the retina so that an image is formed.
Correct me...
I'm sorry that I can't get it comprehensively.
You've mentioned the virtual image to be formed infinitely far behind a convex lens. I'm not sure whether you're referring to an object at exactly the focal length or object lying within the focal length. For the former, the image should at...
I am also thinking in that way but it seems that I can't get a whole picture...
The following question is obtained from a secondary school physics textbook.
A boy holds a magnifying glass at arm's length. He looks at a poster through the glass and sees a magnified erect image. What happens to...
What about if I put an object at the focal length at one end of the lens, and take an photo at the other end of the lens using focus at infinity, will the image become blurred? I'm not a professional photographer, what I think is that our eye works like an camera, both with a convex lens...
To...
If it's the case, what does 'an image is not formed' in the figure mean?
I've searched some Physics books, some say that the image is in infinity and others say no image is formed.
So, I really feel confused as there seems a contradiction.
If our eye can see an image, how will this image look...
For an object at focal length in front of a convex lens, the image formed will be at infinity and the refracted rays are parallel (refer to the figure). Since our eye lens is convex in nature, why don't it converge these parallel rays so that an image can be formed?