If the diameter of your microscope field is 1 mm at low power (10×) and your ocular lens is 10×, then what is the diameter of your field when you switch to the 50× objective lens?
A) 0.02 mm
B) 2 mm
C) 0.002 mm
D) 0.2 mm

Question

Quizplus · Accepted Answer

The total magnification at low power is 10× (objective) × 10× (ocular) = 100×. When switching to the 50× objective, the total magnification becomes 50× (objective) × 10× (ocular) = 500×. The field diameter decreases inversely with the increase in magnification, so if the magnification increases 5 times (from 100× to 500×), the field diameter decreases 5 times. Therefore, 1 mm / 5 = 0.2 mm.

If the Diameter of Your Microscope Field Is 1 Mm