Question

The minimum range for sliding the focusing lens in the internal focusing telescope for focusing at all distances beyond 4 m is

a.

5 mm

b.

10 mm

c.

15 mm

d.

20 mm.

Posted under Civil Engineering

Answer: (d).20 mm.

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Q. The minimum range for sliding the focusing lens in the internal focusing telescope for focusing at all distances beyond 4 m is

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