The sum of the focal lengths of the objective and an eyepiece, in case of an astronomical telescope. is equal to : (final image is at ∞)
the length of the telescope
half the length of the telescope
double the length of the telescope
none of these
A
the length of the telescope
B
none of these
C
double the length of the telescope
D
half the length of the telescope
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Solution
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The sum of the focal lengths of the objective and an eyepiece, in case of an astronomical telescope is equal to the length of the telescope. Hence, option A is correct.
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