"Welcome to my blogger website! Today, I'd like to share with you some notes on two important concepts in optics: Photometry and Wave Optics. Photometry is the study of light as it is perceived by the human eye, while Wave Optics deals with the wave-like nature of light and its interactions with materials and structures. Understanding these concepts is essential for designing and creating optical devices such as cameras, microscopes, and telescopes. In these notes, we'll explore the key principles of Photometry and Wave Optics and their practical applications. Let's dive in!"