Fundamentals of Light: Wave, Interference, and Diffraction

📋 Course Outline

1. Nature of Light
2. Wave-Front Concept
3. Huygen’s Principle
4. Light Interference
5. Interference Conditions
6. Young’s Double Slit
7. Interferometer Function
8. Gravitational Waves
9. Diffraction of Light
10. Diffraction Grating
11. Bragg’s Law
12. Polarisation of Light

📖 1. Nature of Light

🔑 Key Concepts & Definitions

• Wave-particle duality of light: The concept that light exhibits both wave-like and particle-like properties, as debated by scientists such as Einstein (1905), who proposed that light can behave as discrete quanta (photons), and classical wave theories that describe light as an electromagnetic wave.

• Wave nature of light: The idea that light propagates as an electromagnetic wave, characterized by properties such as wavelength, frequency, and wavefronts, supported by phenomena like diffraction and interference (see section 9.2).

• Particle nature of light: The view that light consists of particles called photons, which explains phenomena like the photoelectric effect, as explained by Einstein (1905), emphasizing the corpuscular aspect of light.

• Properties relevant to the nature of light:

  • Wave properties: diffraction, interference, polarization.
  • Particle properties: photoelectric effect, Compton scattering. These properties support the dual nature of light, with the dominance of one aspect depending on the phenomenon observed.

📝 Essential Points