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Q.

In a laboratory four convex lenses L1,L2,L3 and L4 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

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a

L2,L3

b

L1,L4

c

L3,L2

d

L4,L1

answer is D.

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Detailed Solution

To make telescope of higher magnifying power, fo should be large and fe should be least.
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In a laboratory four convex lenses L1,L2,L3 and L4 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