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Mr Ng Han Guan Form 4 Chapter 5: Light Guru Cemerlang Physics MSAB Date: 2 nd edition © 2011 | chp 5 | Maktab Sultan Abu Bakar | Sekolah Kluster Kecemerlangan 10 5.3.1 The Phenomenon Involving Total Internal Reflection of Lights 1. Mirage On a hot day, a distant road will appear to have pools of water lying on the surface. This phenomenon calls as mirage. It’s occurs is due to the different temperature layers of air, hot air on the ground is less dense compare with cold air at higher level on hot day. The sun ray will travel from cool air layer to hot air layer (means from denser to less dense). The sun ray will always refract away from the normal. The total internal reflection will occurs when the angle of incident ray is larger than critical angle and the light ray is reflected upwards. Our eye sight sees straight as though there are pools of water (virtual image of reflection of sky) on the ground. 2. Rainbow When sunlight shines on millions of water droplets in the air after rain, we see a colourful natural phenomenon called rainbow. It caused by refraction, dispersion* and total internal reflection of light within water droplets. When white light from the sun enters the raindrops (less dense to denser), it is refracted and dispersed into its various colour components inside the raindrops. When the dispersed light hits the back of the raindrop, it undergoes total internal reflection (denser to less dense, incident angle greater than critical angle). It is then refracted again as it leaves the drop (incident angle less than critical angle). * Dispersion is the separation of white light into its component colours: ROYGBIV (Red, Orange, Yellow, Green, Blue, Indigo and Violet)
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