In Galilean telescope, if the powers of an objective and eye lens are respectively + 1.25 D and - 20 D, then for relaxed vision, the length and magnification will be
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a
21 .25 cm and 16
b
75 cm and 20
c
75 cm and 16
d
8.5 cm and 21.25
answer is C.
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Detailed Solution
fo=11.25=.8m and fe=1−20=−0.05m∴L∞=fo−fe=0.8−0.005=0.75m=75cmand m∞=fofe=0.80.05=16
In Galilean telescope, if the powers of an objective and eye lens are respectively + 1.25 D and - 20 D, then for relaxed vision, the length and magnification will be