A) five times shorter than of eyepiece
B) shorter than that of eyepiece
C) greater than that of eyepiece
D) equal to that of eyepiece
Correct Answer: C
Solution :
The magnifying power of an astronomical telescope is given by \[=\frac{{{f}_{o}}}{{{f}_{e}}}\,\left( 1+\frac{{{f}_{e}}}{D} \right)\] Therefore, in order to increase the magnifying power of a telescope, the focal length \[{{f}_{o}}\] of the objective lens should be large.
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