SOLUTION: Parabola The Lovell Telescope is a radio telescope located at the Jodrell Bank Observatory in Cheshire, England. The dish of the telescope has the shape of paraboloid with diame

If you read the lesson

    - Parabola definition, canonical equation, characteristic points and elements 

in this site, you will learn that if you write the canonical equation of a parabola in the form

y = ,     (1)


then the distance from the parabola's vertex (0,0) to the parabola's focus  (focal distance) is  .


So, if in your parabola the focal distance is 75 ft, it means that in your equation (1)   = 75.


Hence,  p = 150,  2p = 300, and the equation of your parabola is

y = .


The depth of the dish is   =  =  = 52.083 ft.