Yes. As an antioxidant vitamin c or ascorbic acid is light sensitive.
An antioxidant is a compound that oxidizes so easily that when it is placed in the same solution or reaction hub as another compound, is oxidized preferentially.
That is to say, if the oxygen was a bullet, vitamin C would be the kevlar that takes the oxidizing hit instead.
When chemicals are exposed to light they are receiving energy/enthalpy. More often than not this energy accelerates the rate of a reaction, in this case, increases the rate of oxidation.
Eventually, the vitamin C would be altered with continued exposure, so yes it is a light sensitive analyte.
