Physics

Problem

Which one of the following expresses the correct mathematical relationship between the focal length

f

, image distance

v

, and object distance

u

for a thin lens? a)

\dfrac{1}{f}=\dfrac{1}{v}+\dfrac{1}{u}

\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}

\dfrac{1}{f}=-\dfrac{1}{v}+\dfrac{1}{u}

\dfrac{1}{f}=\dfrac{1}{u}-\dfrac{1}{v}