Light comes from different sources, has energy, and can do work. Plants capture solar energy in photosynthesis which helps produce oxygen. Light travels in lines called rays. Light travels at a speed of over 186,000 miles per second. The interaction of light with different materials are explained. Light travels through things that are transparent, and cannot travel through things that are opaque. Light rays reflect differently off different surfaces. Direct sources of light are luminous and everything seen is from a source of reflected light. Refraction is the bending of light rays when light moves from one transparent medium into another. Students will learn how the eye works and how the brain interprets what it sees. We are shown how the cornea and lens of the human eye refract light. We are shown how Sir Isaac Newton used a prism to separate visible white light into a spectrum. An object absorbs most of the spectrum and reflects certain rays to appear a certain color.