A-Level Physics OCR A H556

4.4.2: Electromagnetic waves

#4.4.2a

electromagnetic spectrum; properties of electromagnetic waves

#4.4.2b

orders of magnitude of wavelengths of the principal radiations from radio waves to gamma rays

#4.4.2c

plane polarised waves; polarisation of electromagnetic waves

Learners will be expected to know about polarising filters for light and metal grilles for microwaves in demonstrating polarisation.

#4.4.2d

(i) refraction of light; refractive index; $n = \dfrac{c}{v}$ ; $n\sin{θ} = \text{constant}$ at a boundary where θ is the angle to the normal

(ii) techniques and procedures used to investigate refraction and total internal reflection of light using ray boxes, including transparent rectangular and semi-circular blocks

PAG6

#4.4.2e

critical angle; $\sin(C) = \dfrac{1}{n}$ ; total internal reflection for light.

4.4.1

Wave motion

4.4.3

Superposition

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