Is the focal length of a concave lens equal to a convex length?
Colin Kaminski - Fri, May 11, 01 12:03:32 AM
I am not sure I understand your question. If you draw a cone starting at a negative focal length (behind a concave lense) you can compare it with the cone after a positive focal point. Does this make any sense? If your goal is to spread a laser beam both lenses are useful. 64.170.192.83
Julie Harpmen - Wed, Dec 19, 01 02:29:19 PM
Yes the focal lengths are the same,
i know because ive been studying light
for the past few
weeks. 207.136.215.129
emma - Tue, Jan 07, 03 04:20:22 AM
where can i find concave lenses. 195.144.131.14