An object is placed in front of a lens which forms an image of the object.
a) if the lens is convex, the image cannot be virtual.
b) if the image is real, then it is also inverted.
c) if the image is real, then it is also upright.
d) if the image is virtual, the lens must be a diverging lens.
e) if the image is virtual, then it is also inverted.

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.

Hydrogen and helium are both members of?

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.