Question

In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is

a.

5.24 cm

b.

6.24 cm

c.

7.24 cm

d.

8.24 cm

Posted under Civil Engineering

Answer: (c).7.24 cm

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Q. In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The...

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