Polaroids at an Angle

Q.

A ray of light traveling along the line $x+y=1$ is inclined on the $x$-axis and after refraction, it enters the other side of the $x$-axis by turning $15°$ away from the $x$-axis. The equation of the line along which the refraction ray travels is

1. $\sqrt{3}y-x+1=0$

2. $\sqrt{3}y+x+1=0$

3. $\sqrt{3}y+x-1=0$

4. None of the above

Q. Two polaroids are crossed to each other. When one of them is rotated through ${60}^{\circ }$, then what percentage of the incident unpolarised light will be transmitted by the polaroids?

1. $37.5\%$
2. $50\%$
3. $66.5\%$
4. $100\%$

Q.

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

1. I₀

2. I₀ / 2

3. I₀ / 4

4. Zero