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

Comments and Answers (2)

Richa

Richa

does anyone know the correct answer

Jasmine

Jasmine

how did the answer came

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