At the end of this lesson you should be able to:

• Use the wave model to explain reflection of light from mirrors and refraction of light as it passes from one medium to another.
• Use the conditions for constructive and destructive interference of waves to explain the interference patterns observed in Young's double slit experiment, single slit diffraction, diffraction grating and thin flm interference.
• Solve problems involving a single slit, a double slit and a diffraction grating.
• Use the wave model to explain plane polarization of light, polarization by reflection and polarization by double refraction.
• Calculate the angle of maximum polarization for reflected light.