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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 [Wrong Answer] |
B. | 6.24 cm [Wrong Answer] |
C. | 7.24 cm [Correct Answer] |
D. | 8.24 cm [Wrong Answer] |