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【简答题】
(a) 计算腔长为 1m 的共焦腔基横模的远场发散角,设 λ = 6328 Å , 10km 处的光斑面积多大。 (b) 有一普通探照灯,设发散角为 2 ° ,则 1km 远处的光斑面积多大?
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