| Date | May 2015 | Marks available | 3 | Reference code | 15M.3.SL.TZ1.4 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Calculate and Sketch | Question number | 4 | Adapted from | N/A |
Question
This question is about polarized light.
An analyser is used with polarized light.
Outline the function of an analyser in this context.
Polarized light of intensity I0 is incident on the analyser.
(i) The transmission axis of the analyser is at an angle of 25˚ to the electric field of the polarized light. Calculate, in terms of I0, the intensity of the light that leaves the analyser.
(ii) The angle θ between the transmission axis of the analyser and the electric field of the polarized light is varied. On the axes, sketch a graph to show the variation with θ of the intensity of the light leaving the analyser.
Markscheme
the angle of polarization/electric field vector can be determined;
(i) (I = I0cos2 25º =) 0.82I0 ;
(ii) cos2 shape; (allow negative intensities for this mark)
max at 0º and 180º, zero at 90º; (allow non-cos2 line for this mark)
