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« Back to Previous Page

A. 5.24 cm B. 6.24 cm C. 7.24 cm D. 8.24 cm
Posted by Civil Engineer
Asked on August 5, 2016 1:19 pm
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C. 7.24 cm

Posted by Civil Engineer
Answered on August 5, 2016 1:20 pm