In a laboratory four convex lenses L 1 , L 2 , L 3 and L 4 of focal lengths 2, 4, 6 and 8 cm, respectively are available. Two of these lenses form a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are respectively
Text Solution
Verified by ExpertsThe correct answer is:
D
Length of tube = 10 cm
f 0 + f e = 10 cm
Magnification m = = 4
f 0 = 4 f E
putting in Eq. (i),
5f e = 10 cm,
or f e = 2 cm,
and f o = 8 cm,
f 0 = 8 cm, f e = 2 cm
Hence, L 4 and L 1 will be used.
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