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GCSE Physics M Manser P5: Space for reflection P5g I can: REFRACTION OF WAVES 5g: Refraction of waves Completed lesson notes State that refraction occurs at a boundary between two media because the speed of the wave changes and more refraction occurs when there is a greater change in the speed. Explain that a change in speed causes a change in wavelength and this may cause a change in direction. Describe why white light can be dispersed into the colours of the spectrum including the order of the colours. Explain what is meant by the critical angle and describe an experiment to find the critical angle between glass and air. Use the formula: refractive index = speed of light in vacuum speed of light in medium, …to find the refractive index of a medium. Explain how the critical angle relates to its refractive index (sinc = nr/ni) Explain the process of total internal reflection and how it is used in optical fibres, binoculars, cat’s eyes in the road and road signs and bicycle reflectors Text book references: P5.13 – Refraction P5.14 – Dispersion of light P5.15 – More on total internal reflection Page: 190 192 194 R / A / G GCSE Physics M Manser 1. WHAT IS REFRACTION Refraction is _______________________ of a wave when ___________________________. The change in direction is caused by ____________________________ of the wave. The more the speed changes _______________________________________. 2. RAY DIAGRAMS When light enters glass, its speed ________________ so it bends ________________ the normal. When light enters air, _______________ __________________________________ __________________________________ __________________________________ ______________________________ The ray that emerges from the glass is ___________________ the original incident ray 3. REFRACTIVE INDEX Refractive index is a measure of how much a substance _______________ light. The higher its value, the _____________________light. The more the light is slowed, the more it __________________ the normal. ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ 4. SNELL’S LAW ______________________________________________ ______________________________________________ ______________________________________________ HW: ALL QUESTIONS ON PAGE191 AND PAGE 193 QU, 1, 2 AND 4 ONLY
