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1. How does a day /night rear view mirror work? [] 2. How is a secondary rainbow formed? [] 3. Why is the human vision blurred under water? [] 4. What are sundogs and how are they formed? [] 5. What does it mean to have polarized light? 6. How has the speed of light been measured in the past by Galileo? 7. According to the legend, the Roman Fleet at Syracuse was burned when Archimedes focused the sun’s rays using a large converging mirror. Was this practical? 8. How is Blue Ray different from High Definition (HD) format? 9. What is dual layered DVD and how is it different then a regular DVD? 10. What is a Fresnel lens how is it different then a regular lens? 10. What is a fibre optics cable? How much data can be sent down one fibre strand?

1. the anti glare setting/ night adjustment on your rear view mirror takes the reflections from your rear glass indirectly from that the light that is reflected from other cars that are behind. 2.a secondary rainbow is generated when sunlight makes //two// internal reflections in the drops instead of one. 3.[|Light rays] bend when they travel from one medium to another; the amount of bending is determined by the [|refractive indices] of the two media. If one medium has a particular curved shape, it functions as a [|lens]. The [|cornea], humours, and [|crystalline lens] of the [|eye] together form a lens that focuses images on the [|retina]. Our eyes are adapted for viewing in air. Water, however, has approximately the same refractive index as the cornea (both about 1.33), effectively eliminating the cornea's focusing properties. When our eyes are in water, instead of their focusing images on the retina, they now focus them far behind the retina, resulting in an extremely blurred image from [|hypermetropia] 4.Sundogs are bright areas on either side of the sun usually superimposed onto an ice halo. Sundogs are also known as mock suns but they are more properly called parhelia. 5.