A microscope with an 8.5 mm focal-length objective has a tube length of 14.0 cm.
For the microscope to be in focus, how far should the objective lens be from the specimen?
Please help i got 16mm but it’s wrong. please help!!
1/ Do + 1/ Di = 1/f
f = 8.5 mm Di = 140 mm
1/Do = 1/8.5 – 1/140 = 0.1105
Do = 1/ 0.1105
Evaluating I get 9.0 mm for the distance of the object from the objective.