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ฟิสิกส์โอลิมปิก วิทยาศาสตร์โอลิมปิก ข้อสอบแข่งขัน ข้อสอบชิงทุน => GRE - Physics => Topic started by: conantee on September 25, 2010, 10:34:36 PM



Title: GR9277.068
Post by: conantee on September 25, 2010, 10:34:36 PM
68. The angular separation of the two components of a double star is 8 microradians, and the light from the double star has a wavelength of 5500 angstroms. The smallest diameter of a telescope mirror that will resolve the double star is most nearly
(A) 1 \mbox{ mm}
(B) 1 \mbox{ cm}
(C) 10 \mbox{ cm}
(D) 1 \mbox{ m}
(E)  100 \mbox{ m}