Optics has a pervasive impact in our daily lives, but that impact is rarely noticed because the products of optical technology are, ironically, often invisible and because we accommodate so swiftly to modern technology. This course is an introduction to optical science with elementary applications. Topics are split into geometrical and wave optics. Geometrical optics includes ray-tracing, lens design, aberrations, and imaging systems. Wave optics includes electrodynamics review, polarization, interference, wave-guiding, Fresnel and Fraunhofer diffraction, image formation, and resolution. Brief introduction on holography and nonlinear optics will be given in the last part. Besides lectures, students will be required to make a hand-on realization of a simple optical system to demonstrate some specific optical properties.