Using a concave lens, one can only obtain a virtual image, which cannot be projected onto a screen. The focal length can be determined by measuring the distance between the lens and the observer's eye when a virtual image is seen. It is not possible to achieve multiple sharp images with a concave lens; only one virtual image is formed regardless of the object distance. In contrast, a convex lens can produce both real and virtual images depending on the object's position relative to the lens.
PREREQUISITESStudents of physics, optical engineers, and anyone interested in understanding lens behavior and image formation in optics.
Using a concave lens you cannot get a real image, to calculate the focal length. All that forms is a virtual one, which only your eyes can see. So try measuring the dist. b/w the lens and your eye when you get to 'see' a virtual image next time!nfsmwbe said:is it true when we use concave lens, we can obtain focal length when we get the sharp image..
As far as my knowledge runs through, you can't (I think so..). I've tried getting those kind of 'double' images, but even when they formed, one was real and another virtual. I couldn't get two sharps at a time on the screen.nfsmwbe said:is it possible to get more than one sharp image when we change the object distance (distance between object and lens)
nfsmwbe said:is it true when we use concave lens, we can obtain focal length when we get the sharp image..
is it possible to get more than one sharp image when we change the object distance (distance between object and lens)
I bought a redwood 2 x 4, and made a 3-legged table. I still have it, concave side up, in our sun room.sophiecentaur said:Is there a happy end to this story or is that mirror now at the back of your garage? haha (I have several such possessions!)