Which of the following is the correct lens formula?

Question

Which of the following is the correct lens formula? (A)  (1/v)- (1/u) = (1/f) (B)  (1/v)+ (1/u) = (1/f) (C) v - u = f (D) v + u = f

Tardigrade Admin · Accepted Answer

The lens formula is given as (1/f) = (1/v) - (1/u), where f - focal length, u- object distance from the lens and v- image distance from the lens. The lens formula is implemented with proper sign convention using cartesian method.

Q. Which of the following is the correct lens formula?

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

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

$v - u = f$

$v + u = f$

The lens formula is given as $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$ , where $f$ - focal length, $u$ - object distance from the lens and $v$ - image distance from the lens. The lens formula is implemented with proper sign convention using cartesian method.

Q. Which of the following is the correct lens formula?

v1​−u1​=f1​

v1​+u1​=f1​

v−u=f

v+u=f

The lens formula is given as f1​=v1​−u1​, where f - focal length, u- object distance from the lens and v- image distance from the lens. The lens formula is implemented with proper sign convention using cartesian method.

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

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

$v - u = f$

$v + u = f$

The lens formula is given as $\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$ , where $f$ - focal length, $u$ - object distance from the lens and $v$ - image distance from the lens. The lens formula is implemented with proper sign convention using cartesian method.