Question

#3. Two convex lenses are used to image objects... Just want to check to see if my answer is correct.

#4. A vertically polarized beam of light... Don't know if the second polarizer should be i=i(sub0)cos(50)^2 or cos(50-20)^2. The wording is throwing me off.

Answer 1

I can only answer one as per guidelines

4)Io=100W/m^2

thetha1=20 degrees

I = I0 cos^ θ

=100*cos^2(20)

=88.23W/m^2

this in turn goes to second polarizer

so

I = I0 cos^ θ

=88.23*cos^2(50-20)

I=66.17W/m^2--answer