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Physics - Optics: Focal Length

Thread starter CTAATGT
Start date Sep 4, 2009

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CTAATGT

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Sep 4, 2009

#1

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When is the focal length (or focal distance) negative?

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Isoprop

Fascinating, tell me more

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15+ Year Member

Sep 4, 2009

#2

CTAATGT said:
When is the focal length (or focal distance) negative?

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

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