In a telescope the object glass of focal length 14 cm, is located at 2 – McqOptions

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1.	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.	D/6m(h1 - h2)3
B.	D/6m(h1 + h2)2
C.	5.24 cm
D.	6.24 cm
Answer» D. 6.24 cm

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