The focal length of the convex lens is

 

A convex lens converges light rays that travel parallel to its primary axis, which is comparatively thick in the centre and thin at the lower and higher ends.

Instead of curving inside, the edges curl outward.

Convex lenses are used in eyeglasses to treat farsightedness, a condition in which the distance between the lens of the eye and the retina is excessively short, causing the focus point to be behind the retina.

Convex lenses enhance refraction and, as a result, shorten the focal length of eyeglasses.

The focal length of the convex lens is Positive.

An optical system's focal length is a measurement of how strongly it converges or diverges light.

It is the inverse of the optical power of the system.

A system with a positive focus length converges light, whereas one with a negative focal length diverges light.

The formula for calculating the focal length of a double convex lens is as follows:

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

Where $\text{u}$ is the measurement of the distance between the object and the lens $\text{v}$, The image-to-lens distance is the distance between the picture and the lens.