For the microscope to be in focus, how far should the objective lens be from the specimen?

NetherCraft 0

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 Answer

  • 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.

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