My professor laid out the problem please help me understand how he filled in the values and solved

PROBLEM 3: In a certain experiment you find that the value of the permittivity space is E:= 100.0 - 10-12 02 N. m? and the value of the permeability is /4 :- 8 . 7 - 10-7. N A2 . (a) What is the ratio of the speed of light in this media to the speed of light? (b) Assume that the light is green so that it has a frequency of J,, :=1.00- 10". 12, how much energy does the light have? (c) What is the momentum of one quanta of light (a photon). (d) what force does the light produce on a mirror placed on the edge of the media so that the light reflects in a time At:= 1.20 10 15 s? (a) Umedia - (6.308 - 107) VE . H media = 0.21 C (b) Egreen -hof, = (6.626 - 10 ") J (c) Pref 2 - Egreen ( 1. 12. 10 27) kg . m S (d) Frejbees :-2. = (7.367 . 10 ) N