[单选题]
Light of wavelength 500 nm illuminates a soap filnbxy./ towfktk; 532 a-e c7whm ( n = 1.s/mga7g o6map sl,/e.33). What is the minimum thickness of film that will give an interference when the light is incident normally on ispl 6 agem7a.,/o gs/mt?
A. $24 \; nm$
B. $94 \; nm$
C. $188 \; nm$
D. $376 \; nm$
