[单选题]
What is the minimum thpqw,w bh*2r f;o(l xl)ickness of a non);)n4 xy9v5 fhpdcv asout3vofi+ 1t8reflecting film coating (n = 1.30) on a glass lens (n = 1.50) for wavelenxt3+o14 v 8vash5du 9i;t) )pfyvo fncgth 500 nm?
A. $250 \; nm$
B. $192 \; nm$
C. $167 \; nm$
D. $96.2 \; nm$
