uses of polarized light

USES OF POLARIZED LIGHT

•Polaroid sunglasses•Liquid Crystal Display•Polarisation of Radio and Microwave signals•Quantum Cryptography•Decoration•3D effects

POLAROID SUNGLASSES• We use Polaroid sunglasses to minimise 'glare'.

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.

POLARISATION OF RADIO AND MICROWAVE SIGNALS

• Using polarisated transmission and reception makes it possible to minimise the use of the 'airwaves'.

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.

APPLICATIONS OF CRYPTOGRAPHY

• ATM• Computer passwords• Electronic commerce

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.

EXAMPLE OF BIREFRINGENCE

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

ACTIVITY IN 3D EFFECTS

ACTIVITYPassed the

Answer

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

QUESTION NO. 2

We use Polaroid sunglasses to minimise _________.

eGlare

QUESTION NO. 3__________ is from the Greek ,kryptós means "hidden, secret“ and Graphein means "writing“

Cryp_ _gr_ _ _yCryptography

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

QUESTION NO. 5

• It is currently the most widely used technology for watching ___________ in theatres.

_D F_ lm_3D Films

Prepared by:Edzon A. Tatualia