On a microscope, why is the field of view brighter under low power?

Question

On a microscope, why is the field of view brighter under low power?

Answer 1

The field of view is much smaller under higher power.  Smaller field of view means fewer photons per second moving toward your eye.

Answer 2

Because the color of a rainbow an only visible in a bent state the same goes for field of view and microsope.