27. According to Kepler’s third law, (a) Mercury travels fastest in the part of its orbit in which it is closest to the Sun. (b) Jupiter orbits the Sun at a faster speed than Saturn. (c) all the planets have nearly circular orbits.

(b)

Explanation:

According to Kepler’s third law, Jupiter orbits the Sun at a faster speed than Saturn.

This law was published in 1619.

Kepler's laws refer to the three scientific laws that describe the motion of planets around the Sun.

He made a major break from ancient beliefs when he abandoned circular orbits in favor of elliptical orbits.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).