5 A coin is placed at the bottom of an empty hemispherical

Last updated: 6/13/2023

5 A coin is placed at the bottom of an empty hemispherical basin The coin is just invisible to the eye looking over the edge of the basin When the basin is filled with a liquid the whole of the coin becomes just visible to the eye placed at the same position If the radius of the coin is r prove that 4 1 Here is the refractive index of the liquid 1 1 and a is the radius of the hemisphere r a