Question

Select the correct lens formula where $u,v,f$ have standard meanings.

• A. $\frac{1}{v}-\frac{1}{u}-\frac{1}{f}=0$
• B. $\frac{1}{u}-\frac{1}{v}-\frac{1}{f}=0$
• C. $\frac{1}{u}+\frac{1}{v}-\frac{1}{f}=0$
• D. $\frac{1}{v}+\frac{1}{v}+\frac{1}{f}=0$

Answer 1

The correct option is A $\frac{1}{v}-\frac{1}{u}-\frac{1}{f}=0$

Lens formula is given by:
$\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$
where:
$v:$ Image distance
$u:$ Object distance
$f:$ Focal length of the lens

Rearranging the equation we get,
$\frac{1}{v}-\frac{1}{u}-\frac{1}{f}=0$