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.

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

What equation is used to calculate the weight of an object on a plant ?