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papercollection2026 Diagram 18 shows light travelling from glass to air.Rajah 18 menunjukkan cahaya merambat dari kaca ke udara.AirUdarapqtsGlassKacaThe refractive index of glass isIndeks biasan kaca ialahDiagram 18 / Rajah 18ABCDsin ssin psin psin ssin tsin qsin qsin t