Material for this Lab Experiment 9 Manual General Lab Docume

Material for this Lab Experiment 9 Manual General Lab Documents TOC and Introduction Appendix A: Error Analysis for the Physics Labs Appendix B: Introduction to Spreadsheets and EXCEL 2010 If two polarizers are aligned so that they are perpendicular, then no light will pass through. If you insert another polarizer in between them at 45 degree with respect to both of them, what fraction of a beam of unpolarized light will get through all three? (Give the answer as a decimal.) Numeric : A numeric value is expected and not an expression. I_Fraction = ______________

Solution

Light transmitted through first polarizer is vertically polarized. Angle between it and second polarizer is =45º.

I2= I1 cos2 (45º)=0.5I1=0.25 I0

Light transmitted through second polarizer is polarized 45º from vertical. Angle between it and third polarizer is =45º.

I3= I2 cos2(45º) I2= I1cos2(45) =0.125 I0