Question

A fish is at a depth of √7 cm and it can see only through a circular section of water surface. What will be radii of this circular surface? What will be radii of this circular surface?  The refractive index of water with respect to air is 4/3.Sketch the diagram also.

Answer 1

Let location of fish is O as shown in figure.

Let PR = r, is the radius of circular part from which fish could see out side object.