Laws of lenses and optical instruments
Article No: P2210202
The focal lengths of unknown lenses are determined by measuring the distances of image and object and by Bessel's method. Simple optical instruments are then constructed with these lenses. To determine the focal length of two unknown convex lenses by measuring the distances of image and object. To determine the focal length of a convex lens and of a combination of a convex and a concave lens using Bessel's method. To construct the following optical instruments: a) Slide projector; image scale to be determined b) Microscope; magnification to be determined c) Kepler-type telescope d) Galileo's telescope (opera glasses). Law of lenses Magnification Focal length Object distance Telescope Microscope Path of a ray Convex lens Concave lens Real image Virtual image Understand a basic optical component: the lens Learn how common optical instruments work Geometric optics in a nutshell