NEET & Advanced Quick Review#

Polarisation#

• Malus’ Law: $$I = I_0 \cos^2 \theta$$

• Brewster’s Law: $$\tan \theta_p = n$$

• Polarisation by Reflection: The polarising angle for a dielectric surface can be calculated using Brewster’s law.

• Polarisation by Scattering: The scattered light can be polarised. The degree of polarisation depends on the scattering angle and the size and shape of the particles.

CBSE Board Exams Quick Review#

Polarisation#

• Types of Polarisation:
  • Linear
  • Circular
  • Elliptical
• Polarising Materials:
• Polaroid sheets
• Calcite crystals
• Applications of Polarisation:
  • Polarising sunglasses
  • 3D movies
  • Microscopes
  • Telescopes
• Polarisation by Double Refraction:
  • Extraordinary and ordinary rays
  • Calcite crystal as an example