The discussion revolves around the properties of concave lenses, particularly regarding the formation of images and the determination of focal length. Participants explore whether multiple sharp images can be obtained by varying the object distance, and they also touch upon comparisons with convex lenses and concave mirrors.
Participants do not reach a consensus on whether multiple sharp images can be obtained with a concave lens, and there are competing views regarding the nature of images produced by concave lenses versus concave mirrors.
Some statements reflect personal experiences and anecdotal evidence, which may not generalize to all situations involving concave lenses or mirrors. The discussion also highlights potential confusion between the properties of different optical devices.
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!)