Refraction of light

What the syllabus asks of you

• Define and use the terms normal, angle of incidence and angle of refraction
• Describe an experiment to show refraction of 6 Define refractive index, n, as the ratio of the light by transparent blocks of different shapes speeds of a wave in two different regions
• Describe the passage of light through a 7 Recall and use the equation transparent material (limited to the boundaries between two mediums only) n = sin i / sin r
• State the meaning of critical angle 8 Recall and use the equation n = 1 / sin c
• Describe internal reflection and total internal 9 Describe the use of optical fibres, particularly in reflection using both experimental and everyday telecommunications examples