Wave Properties:
* Superposition: Waves can interfere with each other, resulting in constructive (amplified) or destructive (cancelled) interference patterns. This is evident in phenomena like Young's Double Slit experiment.
* Diffraction: Waves bend around obstacles, causing light to spread out as it passes through narrow openings. This is why we see the fuzzy edges of shadows.
* Refraction: Waves change direction when passing from one medium to another (e.g., air to water). This is why objects appear distorted underwater.
* Reflection: Waves bounce off surfaces, with the angle of incidence equal to the angle of reflection. This is how mirrors work.
* Polarization: Waves can vibrate in a specific direction, known as polarization. This is used in sunglasses and 3D movies.
Particle Properties (Wave-Particle Duality):
* Photon: Light is also composed of discrete packets of energy called photons, which exhibit particle-like behavior. This is demonstrated in the photoelectric effect, where light can knock electrons off a metal surface.
* Quantization of Energy: The energy of a photon is directly proportional to its frequency, as described by Planck's equation (E = hν). This means light comes in specific energy levels.
* Momentum: Photons carry momentum, which is why light can exert a force on objects (e.g., the pressure of light on a solar sail).
Other Principles:
* Speed of Light: Light travels at a constant speed in a vacuum, denoted by the symbol "c", which is approximately 299,792,458 meters per second.
* Doppler Effect: The frequency of light waves changes depending on the relative motion between the source and the observer. This is known as the Doppler effect and is responsible for the redshift and blueshift of light from distant galaxies.
* Electromagnetic Spectrum: Light is just a small part of the electromagnetic spectrum, which includes a wide range of frequencies from radio waves to gamma rays.
* Special Relativity: Einstein's theory of special relativity dictates that the speed of light is constant for all observers, regardless of their relative motion. This has profound implications for the nature of space and time.
These principles are interconnected and help us understand the fascinating behavior of light, enabling us to develop technologies like lasers, telescopes, and optical fibers.
