Light travels in the straight line because it does not generally interact with the medium and wherever it interacts it does change its path
Answer:
The field of view is widest on the lowest power objective. When you switch to a higher power, the field of view is closes in. You will see more of an object on low power.

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Microscope Notes
Answer:
He did research in genetics.
Explanation:
Genetics is qualities, hereditary variety, and/or heredity in living creatures. It's the largest field of science, however, meets every now and again with numerous other life sciences and is firmly connected with the investigation of data frameworks.