Polaroid glass is used in sun glasses because

It reduces the light intensity to half on account of polarisation

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Solution

The correct option is B It reduces the light intensity to half on account of polarisation
When unpolarised light passes through one polariser, the electric field component of the radiation is restricted to one direction in one plane. So, the intensity is reduced to half. Thus, polaroid glass is used in sun glasses.

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Similar questions

Q. Sun glasses are made of polaroids and not of coloured glasses, why? Give examples for two commonly used devices which make use of polarised light.

Polarised glass is used in sun glasses because

[CPMT 1981]

Q. Assertion :When light ray is incident at polarising angle on glass, reflected light is completely polarised. Reason: The intensity of light decreases in polarisation.

A polaroid is placed at 45^o to an incoming light of intensity I₀. Now the intensity of light passing through polaroid after polarisation would be

(a) What is linearly polarised light. Describe briefly using a diagram how sunlight is polarised.
(b) Unpolarised light is incident on a polaroid. How would the intensity of transmitted light change when the polaroid is rotated?

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