Which of the following would not be useful in trying to correct spherical aberration a. using a combination lens made up of lenses, each of which has a different index of refractionb. using a circular stop to block out the outside rays of lightc. using proper grinding when an object is at a specific distance from the lensd. using a diaphragm to block outside rays of light

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14

the components of a vector are the parts of the vectors that are to each other.

b perpendicular