which describes amara's mistake?
she should have drawn a concave lens instead of a convex lens.
she should have drawn the image right-side up instead of upside down.
ray 2 should cross through the focal point on the right side of the lens.
ray 3 should point at a downward angle after passing through the len

Ray 2 should cross through the focal point on the right side of the lens.

Explanation:

For the image formation of the ray diagram we know that

1) Light ray passing through the lens which is passing through the focus before refraction must become parallel after refraction through lens

2) Light ray passing through the optical center of the lens must move out undeviated from the lens

3) light ray which is parallel to the principle axis before refraction must move through the focus after refraction through lens

so here we can see that ray 2 is incorrectly drawn here

so we have

Ray 2 should cross through the focal point on the right side of the lens.

i believe the answer is electric potential.

explanation:

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.