[单选题]
Lucite has an index of refraction of 1.50. W h/c7 ui8;sn zlz4ba ub8e7n)uhat is its critical angle of iccz1 j1:w3hqwzz at1 1 j*jc4a-hf6w incidence?c1ww-j1zqzwf 1ajz3t:4ac i *hjh6 1c
A. $11.6^{\circ}$
B. $15.4^{\circ}$
C. $41.8^{\circ}$
D. $87.4^{\circ}$
