Question

Consider the following statements A & B and identify correct choice in the given answers
(A) When light falls on two polaroid 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 and material becomes double refractive.

• A. A & B are correct
• B. Both A & B are wrong
• C. A correct B wrong
• D. A wrong B correct

Answer 1

The correct option is A A & B are correct

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.