- #1
givemeknowledge
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Homework Statement
Calculate the focal length of a planoconvex lens that produces a real image 2.5 times as big as the object if the object is 2.5 cm from the lens?
Homework Equations
The only one I can think of is 1/f = 1/v + 1/u
The Attempt at a Solution
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My 'attempt' is 1/f = 1/62.5 + 1/25 = 0.056 but this just seems totally wrong.
Had a whirl at it, but cannot produce an answer, any help would be really appreciated!