Early telescope makers compensated for chromatic aberration by:

Early telescope makers compensated for chromatic aberration by using a concave mirror in place of a concave lens. This was based on the theory that the color of light does not break while getting reflected from a mirror. The color of light does break while getting reflected by a lens and creates a rainbow type color around an object when seen through a concave lens telescope.

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.