BRAINCAKEExam-style Question 2
Question
Unpolarised light of intensity 80 W m-2 is incident on a polarising filter P. The light then passes through a second polarising filter A, whose transmission axis is initially parallel to that of P. Assume the filters are ideal.
(a) State the intensity of the light between P and A. (1)
(b) Filter A is slowly rotated through 360°. Describe how the intensity of the light leaving A changes. (3)
(c) Filter P is removed and filter A is rotated again. Describe and explain what is observed. (2)
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Key terms in this lesson
- transmission axis
- The direction within a polarising filter along which wave oscillations are transmitted; oscillations at right angles to it are absorbed.
More in Optics
- Image Calculations
- Magnification
- Plane Polarisation
- Polarising Filters
- Polarisation by Reflection and Refraction
- Exam-style Question 1
- Exam-style Question 3
- Exam-style Question 4
All 21 lessons in Optics · All Edexcel AS-level Physics topics