Refer to the equation derived in example 5 ($$I=I _{0}\cos ^{2}$$). What angle should the axes of two polarizing lenses make in order to block all light from passing through?

Question

primeralph · Answer

"the equation derived in example 5".

anonymous · Answer

That is this:
$$I=I _{0}\cos ^{2}$$

primeralph · Answer

|dw:1381202164742:dw|

anonymous · Answer

yeah, theta, sorry I can't get it to show up

primeralph · Answer

Is I intensity?

anonymous · Answer

My book doesn't say, but I would assume so

primeralph · Answer

Honestly, I need more information to just say what it is, but it looks like you can just set cos^2(theta) = 0.