A coin lies at the bottom of a tank of water and is viewed vertically from above the surface.
a. (i) The coin appears to be 1.5m below the surface. The absolute refractive index of water is 1.33. Calculate the real depth of the coin.
b. (ii) Determine the percentage error a person makes if he assumes the apparent depth to be the true depth.
c. (iii) If the coin is now lifted upward by 20cm, find its new apparent depth when viewed from the same position.