PHYWE Laws of image construction in lenses and optical systems

Principle The focal lengths of unknown lenses are determined by measuring the image and object distances using the Bessel method. Simple optical instruments are then constructed using these lenses. Tasks Determine the focal length of two unknown convex lenses by measuring the image and object distances. Determine the focal length of a convex lens and a combination of a convex and concave lens using the Bessel method. Construct the following optical instruments: a) Slide projector; determine the image scale b) Microscope; determine the magnification c) Kepler-type telescope d) Galilean telescope (opera glasses). Learning Objectives The Law of Lenses Magnification Focal Length Object Distance Telescope Microscope Ray Path Convex Lens Concave Lens Real Image Virtual Image Benefits Understand the basic optical component: the lens Learn how common optical instruments work Geometrical Optics in a Nutshell