Question

The absolute refractive index for a mineral is defined as the refraction relative to that in air. Then its value for different minerals ranges between:

• A. 1 and 1.2
• B. 1.3 and 2
• C. 2 and 3
• D. 3 and 4.5

Hint:

Refractive index = how much light bends; most minerals: 1.3–2.0 range.

Answer 1

The Correct Option is B

The absolute refractive index of minerals typically ranges between 1.3 and 2.0, depending on composition. Low values are found in light-colored silicates, while higher values occur in denser metallic minerals.