What happens when light rays incident on a convex mirror run parallel to its principal axis?
a. the reflected rays go parallel to the vertex.
b. the reflected rays pass through the focal point.
c. the reflected rays pass through the center of curvature.
d. the reflected rays go parallel to the focal point.

29 !

One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value. how will the electrical force between the charges compare with the original force? a- it will increase to six times the original force. b- it will increase to thirty-six times the original force. c- it will decrease to one-sixth the original force. d- it will decrease to one-thirty-sixth the original force.