[填空题]
Compare the minimum thickness needed for an anti-rkifx+ rxguor5 p h8tm1p2m8,/z j6 1xaeflective coating q ((/)kqjy/hjr smd:p$(n=1.38)$ applied to a glass lens in order to eliminate
(a) blue (450 nm), nm
(b) red (700 nm) reflections for light at normal incidence. nm
