The book is a review of some basics notions in optics. The first chapter starts with a review of Newton?s laws and planetary motion and some related equations. The second chapter deals with the planet earth?s atmosphere; the third is an introduction to remote sensing. Chapter 4 and 5 introduce a background on Maxwell?s laws in electromagnetism and light polarization. Some other topics of interest have been also developed. Among these topics are the light interaction with spherical surfaces and related equations, light Interference, linear polarization by anisotropy, Fourier transform spectroscopy, and an introduction to Lidar.