Two lenses of power - 15 D and + 5D are in contact with each other. The focal length combination is:
Contact — Focal Point Productions, Inc.
Focal Contact (Molecular Biology)
Focal Contact (Molecular Biology)
A stochastic-elastic model of focal contact demonstrating the effect of... | Download Scientific Diagram
L'adhérence cellulaire - Cours de biologie, sur eBiologie.fr
Probing mechanical principles of focal contacts in cell– matrix adhesion with a coupled stochastic–elastic modelling framework by Huajian Gao, Jin Qian, - ppt download
Schematic representation of a focal contact. | Download Scientific Diagram
Two identical equi - convex lenses, each of focal length 'f' are placed side by side in contact with each other with a layer of water in between them as shown in