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[" In an astronomical telescope in norma...

[" In an astronomical telescope in normal adjustment "],[" a straight black line of length "L" is drawn on inside "],[" part of objective lens.The eye-piece forms a real "],[" image of this line.The length of this image is I."],[" The magnification of the telescope is: "],[[" (1) "(L)/(I)," (2) "(L)/(I)+1," (3) "(L)/(I)-1," (4) "(L+I)/(L-I)]]

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