A telescope using light having wavelength 5000 Å and using lenses of focal lengths 2.5 cm and 30 cm. If the diameter of the aperature of the objective is 10 cm, then the resolving limit of telescope is

A telescope uses light having wavelength 5000 Å and using lenses of focal length 2.5cm and 30cm. If the diameter of the aperture of the objective is 10 cm, then the resolving limit and magnifying power of the telescope is respectively

Two lenses of focal lengths 5 cm and 50 cm are to be used for making a telescope.Which will you use for the objective?