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Uses of Polarized Light

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To know the different uses of Polaroids in our daily life.

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Uses of Polarized Light

  1. 1. USES OF POLARIZED LIGHT
  2. 2. •Polaroid sunglasses •Liquid Crystal Display •Polarisation of Radio and Microwave signals •Quantum Cryptography •Decoration •3D effects
  3. 3. POLAROID SUNGLASSES • We use Polaroid sunglasses to minimise 'glare'.
  4. 4. LIQUID CRYSTAL DISPLAYS • is a flat panel display, electronic visual display, or video display that uses the light modulating properties of liquid crystals. Liquid crystals do not emit light directly. • LCDs are available to display arbitrary images or fixed images which can be displayed or hidden, such as pre- set words, digits, and 7-segment displays as in a digital clock. • LCDs are used in a wide range of applications including computer monitors, televisions, instrument panels, aircraft cockpit displays, and signage.
  5. 5. POLARISATION OF RADIO AND MICROWAVE SIGNALS • Using polarisated transmission and reception makes it possible to minimise the use of the 'airwaves'.
  6. 6. QUANTUM CRYPTOGRAPHY • from Greek ,kryptós means "hidden, secret“ • Graphein means "writing“ • is the practice and study of techniques for secure communication in the presence of third parties (called adversaries). • Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, and electrical engineering.
  7. 7. APPLICATIONS OF CRYPTOGRAPHY • ATM • Computer passwords • Electronic commerce
  8. 8. DECORATION • The effects of birefringence can be absolutely stunning. • Birefringence - is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. • These optically anisotropic materials are said to be birefringent or birefractive.
  9. 9. EXAMPLE OF BIREFRINGENCE
  10. 10. 3D EFFECTS • RealD 3D is a digital stereoscopic projection technology made and sold by RealD Inc. • It is currently the most widely used technology for watching 3D films in theatres. Two pairs of RealD glasses demonstrating the polarization effect RealD glasses
  11. 11. ACTIVITY IN 3D EFFECTS
  12. 12. ACTIVITY Passed the Answer
  13. 13. QUESTION NO. 1 ________are used in a wide range of applications including computer monitors, televisions, instrument panels, aircraft cockpit displays, and signage. LLCD/LCD’s
  14. 14. QUESTION NO. 2 We use Polaroid sunglasses to minimise _________. eGlare
  15. 15. QUESTION NO. 3 __________ is from the Greek ,kryptós means "hidden, secret“ and Graphein means "writing“ Cryp_ _gr_ _ _yCryptography
  16. 16. QUESTION NO. 4 _______________ is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. B_ _ _fring_ _ _ _Birefringence
  17. 17. QUESTION NO. 5 •It is currently the most widely used technology for watching ___________ in theatres. _D F_ lm_3D Films

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