Why are the lens in cow eyes shaped differently than the lens in a fish eye?

Me ! a 2 µc charge q1 and a 2 µc charge q2 are 0.3 m from the x-axis. a 4 µc charge q3 is 0.4 m from the y-axis. the distances d13 and d23 are 0.5 m. find the magnitude and direction of the resulting vector r. round your answer to the nearest tenth.

Rohit is trying to tune an instrument

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?