1) how long will the light take in traveling a distance of 500 metres in water , refractive index is 4/3 and the velocity of light in vacuum is 3×10^10cm/s.
2) two lamps of 32 c.p and 8 c.p respectively are placed 2 meters apart. Where should a screen be placed in order that it may be equally illuminated by the lamps?. Note there are two possible position of the screen, hence two possible solutions are required .
3) light is incident at an angle € on one planar end of a transparent cylindrical rod of refractive index ¥ . determine the least value of ¥ so that the light entering the rod does not emerge from the curved surface of the rod irrespective of the value of €.
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