Question

hyy friends ans. this ♥️
✔️ It's a numerical about telescope

Answer 1

it think we have to choose 0.5D and 4D powered lenses...because if we choose lense of power 10D then some defects me come in telescope, so we have to take lenses which are thin (i.e. less power), its our limitations.
SOME DEFECTS that may come due to large aperature are -
1. chromatic abbreation- dispersion of light takes place and image get colourful.
2. spherical abbreation- blur image forms

......i think this could help you....