Major purpose of this lecture is to present on Light and Telescopes. The universe is full of amazing things, but we need help to see most of them. There are many types of light that our eyes cannot see, so we use instruments, such as telescopes, that can detect this hidden light. this lecture briefly describe on what is the main purpose of a telescope and why do stars twinkle. If you pass white light through a prism, it separates into its component colors.