Geometrical Optics: Thin Lens and Optical Devices

This lecture covers the principles of making images with thin lenses, including the behavior of rays passing through the focal point and the optical axis. It also discusses the construction of optical devices such as magnifying glasses, microscopes, and telescopes, highlighting their focal lengths and magnification capabilities. Additionally, the lecture delves into the concepts of beam divergence and diffraction, emphasizing the effects of narrow gaps on light beams and the focusing of diffraction-limited beams by thin lenses.