Hello. I'm a cabinetmaker and my college physics courses are 25 years behind me now. I'd consider it a kindness if someone would answer a question for me regarding magnetism. I have a magnetic strip that is described as having 6.2 lb. of magnetic pull force per lineal foot, 1" wide and 0.020" thick, and at 0" of air gap. How would I recalculate that for a gap of about 1/8" through a transparent material such as lexan? I'm hoping it's as simple as applying some co-efficient or simple calculation based on the gap distance. Thank you.