1_WAVES AND LIGHT

1_WAVES AND LIGHT

1. Diffraction

   • the pending and spreading of wave when it passes through
     • OPENING
     • OBSTACLES

2. Refraction

   • Dispersion
     • separation of waves into its component parts according to a given characteristic
   • Optical Density
     • Determine the behaviour of light as it passes through different medium
   • Principle Of Reversibility
     • light ray that follow the direction of travel is reversed
   • Index of refraction
     • The ratio of speed of light in vacuum to speed of light in other medium

3. Reflection

   • The angle of incident ray is equal to angle of reflection
   • Law Of Reflection

4. Young's Double Split Experiment

   • Light as a wave
     • Coherent Wave
       • Same Phases
       • Same Frequency
       • Same Wavelength
       • Same Colour
     • Incoherent Wave
       • No fixed Phases
       • Different Frequencies

5. Total Internal Refelection

   • When Light passes through
     • Different medium
     • Different Phase
     • Different index of refraction
   • Requirements
     • Light must travel from higher to lower medium and angle incident should be greater than angle of critical
   • Snell's Law

6. Properties Of Wave

   • - Phase
     • Offset of the wave from reference point
   • - Crest
     • The upper part of wave
   • - Through
     • The lower part of wave
   • - Wavelength
     • Distance between one positive amplitude to the next

7. Polarization Of Light

   • Polarized Light
     • Light waves that vibrate in single plane
   • Unpolarized Light
     • Light waves that vibrates in many different plane
   • Polariser
     • Device that allows light with electric field to pass through

8. Wave Interference

   • Two waves in the same medium interact
     • Constructive interference (maximum amplitude)
     • Destructive interference (Zero amplitude)
   • Coherent
     • Composed of wave that have same frequency and constant phase
   • Nodal Line
     • Line or curve which destructive interference occurs.

9. APPLICATION

   • Diffraction Grating
     • Device with large number of of equally spaced parallel slits to produce the interference pattern
   • Thin Film Interference
     • Interference of light wave when they are reflected from the thin layer material
   • Electromagnetic Radiation
     • Radiation that consists of interacting electric and magnetic fields that travel at speed of light.

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