The rays of light that are scattered by the object enter the front lens of the objective giving a very bright image of the protozoan, flagella or bacterium against a very black background.
(The rays of light; are scattered; by the object) (The rays of light that are scattered by the object; enter; the front lens of the objective) (the objective; giving; a very bright image of the protozoan, flagella or bacterium against a very black background)
The rays of light The rays of light that are scattered by the object the objective
are scattered enter giving
by the object
the front lens of the objective
a very bright image of the protozoan, flagella or bacterium against a very black background