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【单选题】
若星光的波长按550 nm (1 nm = 10 -9 m)计算,孔径为 127 cm的大型望远镜所能分辨的两颗星的最小角距离dq(从地上一点看两星的视线间夹角)是:A.
3.2×10 -3 rad.
B.
1.8×10 -4 rad.
C.
5.3×10 -5 rad.
D.
5.3×10 -7 rad.
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