How does the space shuttle maneuver in exosphere

The softest and hardest minerals are: softest hardest

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.