Two thin plano convex lenses of focal length f m in air are

Last updated: 6/11/2023

Two thin plano convex lenses of focal length f m in air are placed at some distance d from each other as shown in the figure The space between the lenses are filled with a substance with refractive index The distance d between the lenses are so adjusted that a parallel beam of light passing through such an optical system remains parallel Refractive index of lens u 3 What is the appropriate relation between u d