What converts for curvature in a field so that a flat field with uniform focus is seen?
A)achromatic objective lens
B)plan-achromatic objective lens
C)spherical correction ocular lens
D)blue filter when placed above the condenser

Question

Quizplus · Accepted Answer

A plan-achromatic objective lens,though more expensive,provides a flat field so that uniform focus is seen across a slide.An achromatic objective lens does not correct for the curvature in a round field,and the edges of the field appear fuzzy or out of focus when the center is in focus.No such thing as a spherical ocular lens exists;a blue filter eliminates the yellow emitted by a tungsten-halogen light bulb.

What Converts for Curvature in a Field So That a Flat