Achromatic aberration in a lens occurs because (a) different wavelengths of light have different indices of refraction, (b) the shape of the lens is not correctly curved so that different light paths don't necessarily converge at the same point, (c) light focused along two different perpendicular planes does not converge at the same point, (d) the lens does not follow a proper moral standard.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !