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Polaroid glass is used in sun glasses because

1. It reduces the light intensity to half on account of polarisation
2. It is fashionable
3. It has good colour
4. It is cheaper

Correct answer: It reduces the light intensity to half on account of polarisation

Solution

Polaroid glass acts as a polarizer. For unpolarized sunlight, it transmits only one component of the electric field, so the intensity is reduced to about half after passing through a single ideal Polaroid sheet.

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