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.
If you do need a system installed in your home, expect to pay between $750 and $3,000 for a professionally installed radon mitigation system. The size of your house, the type of system you have installed, and the level of radon gas in your house will determine where you fall on that cost spectrum.