What is a Polaroid?state its 'two' uses
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A Polaroid is a material which polarises light. The phenomenon of selective absorption is made use of in the construction of polariods. There are different types of polaroids.
A Polaroid consists of micro crystals of herapathite (an iodosulphate of quinine). Each crystal is a doubly refracting medium, which absorbs the ordinary ray and transmits only the extra ordinary ray. The modern polaroid consists of a large number of ultra microscopic crystals of herapathite embedded with their optic axes, parallel, in a matrix of nitro - cellulose.
Recently, new types of polariod are prepared in which thin film of polyvinyl alcohol is used. These are colourless crystals which transmit more light, and give better polarisation.
Uses of Polaroid
1. Polaroids are used in the laboratory to produce and analyse plane polarised light.
2. Polaroids are widely used as polarising sun glasses.
3. They are used to eliminate the head light glare in motor cars.
4. They are used to improve colour contrasts in old oil paintings.
A Polaroid consists of micro crystals of herapathite (an iodosulphate of quinine). Each crystal is a doubly refracting medium, which absorbs the ordinary ray and transmits only the extra ordinary ray. The modern polaroid consists of a large number of ultra microscopic crystals of herapathite embedded with their optic axes, parallel, in a matrix of nitro - cellulose.
Recently, new types of polariod are prepared in which thin film of polyvinyl alcohol is used. These are colourless crystals which transmit more light, and give better polarisation.
Uses of Polaroid
1. Polaroids are used in the laboratory to produce and analyse plane polarised light.
2. Polaroids are widely used as polarising sun glasses.
3. They are used to eliminate the head light glare in motor cars.
4. They are used to improve colour contrasts in old oil paintings.
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A Polaroid is a material which polarises light.
Two Uses of Polaroids
• Polaroids are used as polarizing Sun glasses.
• Polaroids are used to eliminate the head glare in motors
Characteristics of Polaroids
• Polaroids transmit light only in one direction.
• Polaroids are dichloric substances prepared artificially.
• A Polaroid consist of micro crystals of herapathite.
• Each crystal is a doubly refracting medium which absorbs ordinary ray
and transmits only the extraordinary ray.
• The modern Polaroid consist of a large ultramicroscopic crystals of herapathite.
• Now new types of Polaroids are prepared in which thin film of polyvinyl alcohol is used.
•These colourless crystals transmit more light and give better Polarization.
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