On a hot summer day in a desert the refractive index of the atmosphere changes with height (y) above the surface of the earth as `mu = m_(0) (1 + by)^(1//2)` where `m_(0)` is the refractive index at the surface and `b = 6 ×x 10^(-4) m^(-1)`. A man of height 1.5 m is standing on a straight level road. Calculate the distance beyond which he cannot see a point on the road.

Answer

100m