Question

Two tourmaline crystals are oriented with their crystallographic axes making an angle of 30⁰. What percentage of the incident unpolarised light would pass through the system?

• A. 25
• B. 37.5
• C. 45
• D. 75

Answer 1

Answer: (B)

37.5

Answer 2

I = cos² 30

$\frac{I}{I_{0}}$= $\frac{3}{8}$= .375 ̃ 37.5%