What causes the phases of the moon as seen from earth?
a-light from the sun reflects off the moon as it orbits earth
b-hundreds of thousands of miles lie between the moon and earth.
c-earth’s shadow projects onto the moon.
d-earth spins on its axis relative to the moon.
e-earth has an atmosphere, and the moon doesn’t.
giving brainliest

A-Light from the Sun reflects off the Moon as it orbits Earth

Explanation:

The cause of phases of the Moon as seen from Earth is when light from the Sun reflects off the Moon as it orbits Earth.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

its lower due to the doppler effect.: apex