+4 The intensity, Io, of a light source is reduced to I after passing
through d metres of fog, according to the formula I=Io(e)^-0.12X.
a) If the initial intensity was 1200 lumens, at what distance, to the nearest hundredth of a metre, will the intensity be reduced to 200 lumens?
b) What percentage of the intensity is lost if light passes through four metres of fog? Answer to the nearest whole number
