Why do plane mirrors and convex mirrors form only virtual images?
a. because the focal point is in front of the mirror
b. because they cannot make light rays converge
c. because they only reflect light
d. because they both show a wide angle of view

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

What can you increase the strength of an electromagnet by

Ain is , is 's of ? 0.62 0.79 1.27 1.50