Two objects, object a and object b, need to be identified. object a's index of refraction is determined to be 1.77, and object b's index of refraction is determined to be 1.333. knowing this information, which of the following must be true?

a. light can pass through object b faster than it can pass through object a.
b. the optical density of object a is lower than the optical density of object b.
c. the optical density of object b is higher than the optical density of object a.
d. light can pass through object a faster than it can pass through object b.