Polarized sunglasses are specialized eyewear designed to reduce glare from surfaces such as water, snow, and glass. Glare distorts the true color of objects and makes them harder to distinguish. Polarized sunglasses can be useful for certain sports and driving, helping participants to see more clearly and avoid potential hazards. Polarized lenses are available in a variety of colors, depending on the material from which the lenses are made. Darker colors provide higher levels of polarization.
They are common in consumer devices such as DVD players, gaming devices, clocks, watches, calculators, and telephones, and have replaced cathode ray tube (CRT) displays in most applications.
The LCD screen is more energy efficient and can be disposed of more safely than a CRT.
Its low electrical power consumption enables it to be used in battery-powered electronic equipment.
Cryptography (or cryptology; from Greek κρυπτός kryptós, "hidden, secret"; and γράφειν graphein, "writing", or -λογία -logia, "study", respectively) is the practice and study of techniques for secure communication in the presence of third parties (called adversaries). More generally, it is about constructing and analyzing protocols that block adversaries; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, and electrical engineering. Applications of cryptography include ATM (Automatic Teller Machines) cards, computer passwords, and electronic commerce.
Uses of Polarized Light
•Liquid Crystal Display
•Polarisation of Radio and
• 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
• 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'.
• 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
• The effects of birefringence can be
- is the optical property of a material
having a refractive index that depends on
the polarization and propagation direction of
• These optically anisotropic materials are said
to be birefringent or birefractive.
• 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