What happens to light when it enters a lens?
a. it speeds up.
b. it is reflected.
c. it is refracted.
d. it becomes brighter.

Am i correct on these two physics questions?

One kind of e-book display consists of millions of very small spheres that float in a thin fluid layer between two conducting transparent plates. each sphere is black on one side and white on the other, and possesses an electric dipole moment directed from the white side to the black. when an electric field is applied between the plates, the spheres rotate so that their dipole moment lines up with the field. depending on the fields direction, either the black or the white sides of th espheres can be made visible.the dipole moment of the spheres can be modeled as two opposite charges of magnitude 3.5 x 10^-15 c, separated by a distancce of 100 micrometers (um). what is the maximum possible torque on a sphere if the electric field between the transparent plates is 4.0 x 10^5 n/c

|| communications satellites are placed in circular orbits where they stay directly over a fixed point on the equator as the earth rotates. these are called geosynchronous orbits. the altitude of a geosynchronous orbit is 3.58 * 107 m (22,000 miles). a. what is the period of a satellite in a geosynchronous orbit