The length of a telescope is 2m and the focal length of the objective is 2.0cm .what is the focal length of the eyepiece?
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Explanation:
Given, u=−2000m,v=?,f=200cm=2m
From lens formula, v1−u1=f1⇒v1+20001=21
v1=21−20001=20001000−1=2000999
v=9992000
Magnification, uv=m=999×20002000=9991
Size of image =9991×50×100cm≈5cm
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