Why real image only creates in concave mirror and convex lens?
2006-08-06 05:41:53 · 4 answers · asked by star123 2 in Science & Mathematics ➔ Physics
"real" images are images which truly exist and are not "imagined" by the brain.
As a thought proof, imagine placing a screen. If an image falls on that screen then the image is real.
Think of yourself in front of a mirror. You obviosly see yourself in it. But the image is invented by your brain, for there is no true image of yourself behind the mirror pane. It just so happens that the light rays are reflected off the mirror. Since our mind is "programmed" to think that light can only come off an image, it invents an image of yourself behind the mirror - from where the eye thinks that the light rays have originated!
Since convex lenses spread out light rays, they never focus to form a real image. But if you observe from behind the lens, our brain traces the supposed point of origin of the diverging rays, creating a virtual image.
2006-08-06 06:08:02 · answer #1 · answered by alexsopos 2 · 0⤊ 0⤋
Concave mirrors and convex lenses are able to bring a bunch of rays of light to one point. Other objects can't.
Th
2006-08-06 14:51:53 · answer #2 · answered by Thermo 6 · 0⤊ 0⤋
Because the rays which the mirror/lens direct through the focal point actually go through the focal point, which means that the convergence of the rays in the image actually occurs--it's not just an extrapolation of your visual cortex.
2006-08-06 13:07:09 · answer #3 · answered by Benjamin N 4 · 0⤊ 0⤋
coz convex image creates a virtual and erect image... DUH! :P :P
2006-08-06 12:56:47 · answer #4 · answered by Shariq M 5 · 0⤊ 0⤋