Question

What are the mathematical calculations of convex and concave lenses

Answer 1

concave=F1+F2=P
convex=F1×F2=P

Answer 2

$\texttt{Heya!!}$

$\mathsf{Answer}$

If the focal length is negative, it implies that the lens is concave (diverging), while if positive it implies that the lens is convex (converging lenses). If the image distance is calculated to be negative, it implies that the image formed is virtual and on the same side as the object.

To measure the focal length of a converging(convex) lens. To measure the focal length of a converging (convex) lens. Using the formula: 1/u + 1/v = 1/f, the focal length f of the lens can be found.

Thanks!!