An observatory plans to build a ground-based telescope with an aperture of that must…

PHYSICS · Single correct · A Level · Physics · Astrophysics · Astrophysics

Problem

An observatory plans to build a ground-based telescope with an aperture of

4\,\text{m}

that must be free from chromatic aberration. Which of the following designs is most suitable? (a) Refracting telescope with a

4\,\text{m}

diameter achromatic doublet objective lens (b) Newtonian reflecting telescope with a

4\,\text{m}

diameter parabolic primary mirror (c) Newtonian reflecting telescope with a

4\,\text{m}

diameter spherical primary mirror (d) Galilean telescope with a

4\,\text{m}

diameter convex objective lens and concave eyepiece