Thin lens sign conventions (article) | Khan Academy
The focal length of a thin lens made from the material of refractive index 1.5 is 15 cm. When it is placed in a liquid of refractive index 4/3 , its focal
Thin Lens Equation (6 of 6) Concave Lens - YouTube
Thin Lens Equation Examples & Problems | What is the Thin Lens Equation? - Video & Lesson Transcript | Study.com
Compound Lenses - Definition, Types of Lens, Formula, Application, Video and FAQs
Thin lens equation and problem solving (video) | Khan Academy