Finding Distance of Visible Horizon in Surveying|Solved Problem

In this video we will learn how to find distance of visible horizon in surveying #civilengineering #feexam #surveying #levelling Question: An observer standing on the deck of a ship just sees the top of a lighthouse. The top of the lighthouse is 40 m above the sea level and the height of the observer's eye is 6 m above the sea level. Determine the distance (in km) of the observer from the lighthouse.