A magnifier has a magnification of 8 x. How far from the lens should an object be placed so that it’s virtual image is at the near-point distance of 25 cm?

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

Which statements did both aristotle and ptolemy assume? check all that apply.

Which of the following is tru about semi-conductors