Question

which statement is most accurate?
the more optically dense the material, the higher the refractive index.
the greater the optical density of the material, the lower the refractive index.
the greater the physical density of a material, the higher the refractive index.
the greater the physical density of a material, the lower the refractive index.

Explanation:

Optical density is a property directly linked to a material's refractive index: a higher optical density means the material slows light more, which corresponds to a higher refractive index. Physical density (mass per volume) has no consistent direct relationship with refractive index—materials can have high physical density but low refractive index, and vice versa.

Answer:

The more optically dense the material, the higher the refractive index.