The advantage of an interferometer is that .

Question

(a)  the resolution  is dramatically increased .  ( b) the focal length is dramatically increased . ( c)  the light - gathering power is dramatically increased . ( d) diffraction effects are dramatically decreased . (d) chromatic  aberration is dramatically decreased. 

Answer 1

(a) The resolution is dramatically increased. Interferometers use nanometer precision to measure shapes, which makes them very accurate (down to one nanometer.)