Where are most experiments done? explain the benefits of this choice.

Hello!

Where are most experiments done?

The answer is a laboratory.

The benefits of this choice are that the laboratory is a controlled environment, where all the variables are controlled (a clean place, the temperature is controlled, the pressure is controlled, etc) and this allows us to have a better description of the phenomena that you are observing. Also having a controlled experiment allows doing the same experiment anywhere in the world, in order to see the repetitively of the experiment when is done in other laboratory and by other scientists.

i think it is non rem sleep

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length