The light rays are refracted by the cornea onto the lens. The light rays are refracted a second time whilst passing through the lens and focussed onto the retina â the light sensitive part of the eye. The image formed on the retina is inverted (upside down) and real (the light rays travel through the image).
Nationally, professionally-installed radon mitigation system costs average $1,200, but range from $800 to $1,200 in Colorado, assuming there aren't any problems encountered during installation.*. Costs are highly dependent on what is required to vent the radon and how to route it through the house.
There are different types of radon tests. Only a licensed radon tester can perform such a test, and a homeowner can expect to pay around $200. The average cost of testing and installation of a radon mitigation system is $758, explains the Home Advisor website. Most homeowners spent between $644 and $872 for radon testing and mitigation of the gas. Radon gas can get into a home through water and natural gas supply lines.