Let's deal with the question one piece at a time:
-- "What value did you calculate for the index of refraction of the glass block in Part 2 ?" . . . . . We were not present for the calculation in Part-2, and have no idea what was going on in that part.
-- "How does your value compare to the accepted value of 1.53 ?" . . . . . Since we were not present for Part-2 and didn't do any calculation, we have nothing to compare with the accepted value of 1.53 .
-- "Calculate the percentage error." . . . . . Since we have no record of a calculation pursuant to Part 2, and are unable to compare it to any other number, we have no way to describe any relationship between them.
-- "Different materials have distinct indexes of refraction. Explain how you might identify a material based on experiments like this one." . . . . . We have no description of the protocol or results of the experiment, so we have no way to explain anything based on it.
-- "Mention at least one of the difficulties in identifying materials based on their indexes of refraction." . . . . . One such drawback is the difficulty of obtaining a sample of the material that is sufficiently, sufficiently homogeneous, and of a useful size and shape, so that a beam of light can be directed through the sample, and accurate representative measurements made of the sample's influence on the light.
