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What is A sunscreen ointment has a Sun-Protection-Factor (SPF) of 15.How much of UV radiation it filters out. and explain in detail?
"SPF 15" means that 1/15th of the burning radiation reaches the skin through the recommended thickness of sunscreen SPF 15 sunscreens filter out about 93% of UVB rays, while SPF 30 sunscreens filter out about 97%, SPF 50 sunscreens about 98% Ref: https://en.m.wikipedia.org/wiki/Sunscreen