Question

Select the correct lens formula from the given options.

• 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. $\frac{1}{v}$ - $\frac{1}{u}$ + $\frac{1}{f}=0$

Answer 1

The correct option is A

$\frac{1}{v}$ - $\frac{1}{u}$ - $\frac{1}{f}=0$

Len's formula, $\frac{1}{v}$ - $\frac{1}{u}$ = $\frac{1}{f}$

Rearranging the equation we get,

$\frac{1}{v}$ - $\frac{1}{u}$ - $\frac{1}{f}=0$ .