None, since there is no such measure as an angstrong. The measurement is named after the Swedish physicist Angstrom and you should have the common decency to make the effort to spell the name correctly. 70 Angstrom = 7*10-9 metres or 7 billionths of a metre.
We know that one Angstrom = 1×10−10 meters and 1 meter=1000 mm so 1x10-10 meters x 103 mm/ meter = 10-7 mm
The wavelength of an ultraviolet wave typically ranges from about 10 nanometers to 400 nanometers. This places ultraviolet waves just outside the visible light spectrum, which generally ranges from 400 to 700 nanometers.