WAEC Physics 2017 Theory — Question 24
Question 24 of 33 from the West African Examinations Council (WAEC) Physics 2017 Theory paper, with the correct answer and a full explanation.
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10(c)(ii) The angular magnification of an astronomical telescope in normal adjustment is 5, if the focal length of the objective is 100cm, calculate the: (I) focal length of the eyepiece; (II) length of the telescope
Model answer
fo=100cm, m=5. Since m=fo/fe: fe=fo/m=100/5=20cm. (II) Length of telescope = fe+fo = (100+20)cm = 120cm.
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