Refraction at plane surfaces- Old is Gold

  1. Why do in summer, roads often appear to be covered with water when seen from a distance? Explain.
  2. Why does a clear pool of water always appear to be shallower than it actually is?
  3. Why does the sun look a little oval then it is at the horizon?
  4. Why does diamond sparkle?
  5. A ray of light in air strikes a glass surface. Is there a range of angles for which total internal reflection takes place?
  6. Can total internal reflection be achieved if object originates in rarer medium? Explain with a diagram to justify your answer.
  7. If a plane glass slab is placed on letter of different colours, then violet coloured letters appear more and more raised up. Why?

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