The focal length of the objective of an astronomical telescope is 1 m and it is in normal adjustment. Initially the telescope is focused to a heavenly body. If the same telescope is to be focused to an object at a distance of 21 m from the objective, then identify the correct choice
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a
eye piece should be displaced by 2 cm away from the objective
b
eye piece should be displaced by 2 cm towards the objective
c
eye piece should be displaced by 5 cm towards from the objective
d
eye piece should be displaced by 5 cm away from the objective