Which form of energy is involved in weighing fruit on a spring scale?
a. kinetic energy and gravitational potential energy
c. gravitational potential energy and nonmechanical energy
b. elastic potential energy and nonmechanical energy
d. gravitational potential energy and elastic potential energy?

d. gravitational potential energy and elastic potential energy

Explanation:

when fruits are weighed on the weighing scale using spring balance then the spring is stretched due to weight of the fruits

So here if the spring comes to rest just by stretching the spring by some amount of "x"

So here in that case we can say that the object will go down by same amount that is the amount of spring stretch

Now the gravitational potential energy of the spring will decrease as the height decreases and the same amount of spring potential energy will increase in that case.

So here we can say

loss in the gravitational potential energy = gain in the spring potential energy

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.