What does v represent in the lens formula?

The lens formula is the relationship between the object's distance, the image's distance, and the focal length of a lens.

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

where v is the image's distance from the lens, u is the object's distance from the lens, and f is the lens's focal length.

Therefore, 'Distance of image from the lens' is the correct answer.