Solution:
Ocular lenses are close to the eyepiece and objective lenses are close to the object being examined.
The simplest microscope of all is a magnifying glass made from a single convex lens, which typically magnifies by about 5–10 times. Microscopes used in homes, schools, and professional laboratories are actually compound microscopes and use at least two lenses to produce a magnified image.
Thus this is the required answer.
The atmosphere is a mixture of gases that surrounds the earth
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