Answer:
The oblique illumination is
used by the microscopists to resolve N. Spencrii in the Dark Field Condensers.
Explanation:
It was found that the use of oblique light was required to resolve the striae. Oblique illumination was the first step toward dark field microscopy. In dark field, light
seems to radiate from the specimen while all the rest of the field is black. Resolution is as good as that in bright field while contrast is enhanced.
In dark field microscopy, no
direct light from the condenser enters the objective lens. Only light
that is reflected, refracted or diffracted by the specimen enters the objective. The dark field condenser produces a circle of light. The
light is at an extremely oblique angle to the surface of the slide. This
oblique light comes to a focus on the specimen. It then diverges so
strongly that no direct light enters the objective. This type
of illumination is a hollow cone of light.
<span>It is important that the constitution makes specific effort
to protect the expression of unpopular views because if some topics of forms of
speech were to be forbidden, then the power to set the standard to restrict any topic
of discussion that is considered improper would have to be given to a
particular government agency. More so, freedom of expression is an essential component
of Personal Liberty. Freedom is nothing if there are topics that are off-limits.</span>
Answer: D. A government website on US history.
Government websites are very trust-worthy sources of information as they have large teams that monitor their quality constantly. They also strive to be objective and non-partisan. On the other hand, an inventor's website or a personal blog could be biased. A "history for kids" website, although occasionally useful, could oversimplify information or only provide it at a superficial level.
