(Q).
The more curved the surface of a lens is, the more it refracts light.  Jeff built a lens with the highest refraction possible. The lens is likely very or not curved?
(A).
very


(Q).
As the distance between the objects increases, the force of gravitational attraction decreases.  Would an astronaut floating five million miles away from the Earth experience less gravitational attraction to the Earth than an astronaut on the surface of the Earth or more gravitational attraction to the Earth than an astronaut on the surface of the Earth?
(A).
less gravitational attraction to the Earth than an astronaut on the surface of the Earth


(Q).
Less photosynthesis means that plants and phytoplankton produce less food.  If Mona owns a greenhouse and she decides to cover the top up to restrict sunlight, what happens to her plant's ability to make food increases or decreases?
(A).
decreases