An object on mars (where gravity is much less strong than on earth) would be affected in which of the following ways?
a. it will have less mass.
b. it will have more mass.
c. it will have less weight.
d. it will have more weight.

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?