How can the effect of chromatic aberration be reduced? a) by using multiple lenses b) by reducing the focal length c) by using a larger objective lens d) by making the telescope larger

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.