CTAATGT Full Member 10+ Year Member Joined Aug 8, 2009 Messages 36 Reaction score 1 Sep 4, 2009 #1 When is the focal length (or focal distance) negative? Members don't see this ad.
Isoprop Fascinating, tell me more 10+ Year Member 15+ Year Member Joined Oct 16, 2007 Messages 4,197 Reaction score 36 Sep 4, 2009 #2 CTAATGT said: When is the focal length (or focal distance) negative? Click to expand... it means the lens is diverging (concave) lens. or it means the mirror is convex. http://www.physics.uc.edu/~sitko/CollegePhysicsIII/23-Mirrors&Lenses/Mirrors&Lenses.htm Upvote 0 Downvote
CTAATGT said: When is the focal length (or focal distance) negative? Click to expand... it means the lens is diverging (concave) lens. or it means the mirror is convex. http://www.physics.uc.edu/~sitko/CollegePhysicsIII/23-Mirrors&Lenses/Mirrors&Lenses.htm