Consider the following statements A and B and identify the correct answer
A) When light falls on two polariod sheets having their axes mutually perpendicular it is completely extinguished
B) When polyvinyl alcohol is subjected to a large strain the molecules get oriented parallel to the direction of strain then material becomes dichoric

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A is false but B is true

A is true but B is false

Both A and B are true

Both A and B are false

answer is C.

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Detailed Solution

Statement A is true because when light passes through two axis mutually perpendicular, the light is completely extinguished. When it passes the 1
st
polaroid, it is polarized in a certain direction and when passed through the other polaroid nothing comes out because its orientation is perpendicular to the polarization of light.

When a large strain is applied on the molecules, they get oriented in the direction of strain and material becomes double refractive. Thus statement B is correct.

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