How many focal points and focal lengths do converging and diverging lenses have?

1 Answer
Adrian G.
Apr 12, 2018

All lenses have two focal points and technically two focal lengths.

Explanation:

All lenses have two focal points (one on the left and one on the right).
They have one focal length (magnitude), but if you're paying attention to positive and negative values, then lenses have two focal lengths: one towards the right focal point, and the other going towards the left focal point.

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