An astronomical telescope of tenfold angular magnification has a length of 4.4 cm. The focal Iength of the objective is
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40 cm
Explanation:
Length of astronomical telescope (f0 + fe) = 44 cm and ratio of focal length of the objective lens to that of the eye piece f0/fe =10
From the given ratio, we find that f0 = 10 fe.
Therefore 10fe + .fe = 44 or fe = 4 cm and focal length of the objective (f0)
= 44 - fe = 44 - 4 = 40
Explanation:
Length of astronomical telescope (f0 + fe) = 44 cm and ratio of focal length of the objective lens to that of the eye piece f0/fe =10
From the given ratio, we find that f0 = 10 fe.
Therefore 10fe + .fe = 44 or fe = 4 cm and focal length of the objective (f0)
= 44 - fe = 44 - 4 = 40
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