The angle of rotation depends upona.Nature of the solventb.Nature of substancec.all of themd.Length of tube containing solution through which light passes

The angle of rotation in polarimetry, which is the measurement of the optical activity of a substance, depends on several factors:

a. Nature of the solvent: The solvent used can affect the angle of rotation. Different solvents can interact differently with the substance, which can change its optical activity.

b. Nature of substance: The inherent properties of the substance, such as its molecular structure and chirality, play a significant role in determining its optical activity and thus the angle of rotation.

c. All of them: This option suggests that the angle of rotation depends on all factors mentioned in the options, which is true. The angle of rotation is not determined by a single factor but is a result of the interplay of several factors.

d. Length of tube containing solution through which light passes: The path length of the light through the solution also affects the angle of rotation. The longer the path length, the more the light interacts with the substance, and the greater the rotation.

So, the correct answer is c. All of them. The angle of rotation depends on the nature of the solvent, the nature of the substance, and the length of the tube containing the solution through which light passes.