Five telescopes all have the same magnifying power. Given the focal length of the objective, rank them

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Five telescopes all have the same magnifying power. Given the focal length of the objective, rank them in order of the focal length of the eyepiece, greatest to smallest. 

(a) fo = 80 cm; 

(b) fo = 60 cm; 

(c) fo =100 cm; 

(d) fo = 50 cm; 

(e) fo = 120 cm.
A telescope mirror has a radius of curvature

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