Materials (like LEDs or stars) create their own light. Absorption: Electrons soak up specific photon energies. Reflection: Light bounces off the surface. Transmission: Light passes through the material. 🔬 Key Optical Properties 1. Absorption and Selective Reflection This is the most common cause of color. Pigments: Absorb certain wavelengths and reflect others.
Used on glasses and camera lenses to reduce glare. To help you explore this further, let me know: Are you studying this for a physics or chemistry class?
Use total internal reflection to carry data over long distances. Colour and The Optical Properties of Materials:...
Explains why the sky is blue (small molecules scatter shorter blue wavelengths).
Color produced by the physical structure of the material rather than chemical pigments. Materials (like LEDs or stars) create their own light
Explains why clouds look white (larger water droplets scatter all wavelengths equally). 4. Interference and Iridescence
The bending of light as it passes from one medium to another. Measures how much light slows down. Transmission: Light passes through the material
Microscopic patterns in butterfly wings or peacock feathers cancel out some colors and amplify others. 🏗️ Material Classes Material Type Typical Interaction Visual Result Metals High electron density reflects almost all light. Shiny, opaque, often "silvery." Semiconductors Absorption depends on "band gap" energy. Can be transparent (glass) or opaque (silicon). Polymers Long chains often allow light to pass through. Usually transparent or translucent unless dyed. 💡 Practical Applications