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3.2 Light
3.2.1 Reflection of light
1 Define and use the terms normal, angle of incidence and angle of reflection
2 Describe an experiment to illustrate the law of reflection
3 Describe an experiment to find the position and characteristics of an optical image formed by a plane
mirror (same size, same distance from mirror as object and virtual)
4 State that for reflection, the angle of incidence is equal to the angle of reflection and use this in
constructions, measurements and calculations
3.2.2 Refraction of light
1 Define and use the terms normal, angle of incidence and angle of refraction
2 Define refractive index n as n = sin i
sin r
; recall and use this equation
3 Describe an experiment to show refraction of light by transparent blocks of different shapes
4 Define the terms critical angle and total internal reflection; recall and use the equation
n = 1
sin c
5 D
