The focal length of a lens is expressed by which of the following:
A. \(\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\)
B. \(\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\)
C. \(\frac{1}{f}=\frac{1}{v}=\frac{1}{u}\)
D. \(\frac{1}{f}=\frac{1}{u-frac{1}{v}\)
Answer:B
The focal length of a lens is expressed by which of the following:
A. \(\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\) B. \(\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\) C. \(\frac{1}{f}=\frac{1}{v}=\frac{1}{u}\) D. \(\frac{1}{f}=\frac{1}{u-frac{1}{v}\)