In one of the experiment performed by two students ''Abraham'' and ''Fienkelstein'' for measurement of optical activity of a substance. Result given by ''Abraham'' was. It is d-form with `+30^(@)` rotation and by ''Fienkelstein'', it was : It is l-form with `-150^(@)` rotation. One of them can be correct only as solution can either be d form or, l-form.
Which of the following is correct measure to come out of this dispute?

Options

A. Result with acute angle is correct.
B. Result with obtuse angle is correct.
C. Students should perform another experiment by varying the concentrations or length of palarimeter tube to which angle of rotation is directly proportional.
D. Students should perform the experiment again with precaution. They will come on same conclusion as one of them must be committing observational mistake.

Answer

C