Lustre doesn’t depend on
- ARefractive index mineral
- BAbsorption of mineral
- CTransmittance of mineralCorrect
- DNature of reflecting surface
Solution
Concept
Factors influencing mineral lustre
Formula
NONE
Step-by-step solution
1. Lustre refers to the way light reflects off the surface of a mineral. 2. It depends on the refractive index, absorption capacity, and nature of the reflecting surface. 3. Transmittance refers to light passing through a material, which determines transparency rather than surface lustre. Answer: C
Explanation
Lustre is a physical property that describes how light reflects off the surface of a mineral, which relies on the refractive index, absorption, and surface texture. Transmittance refers to the light passing through the body of a mineral, which dictates transparency rather than surface reflectivity. Therefore, the lustre of a mineral does not depend on its light transmittance.
Why the other options are wrong
A) The refractive index directly affects how light reflects from the mineral surface. B) Absorption affects the intensity of light reflected by the mineral. D) The nature of the reflecting surface dictates how light scatters and defines lustre.
Shortcut
Lustre is a surface reflection phenomenon, so it does not depend on internal Transmittance.
Common mistake
Confusing light transmittance with surface reflection properties that determine lustre.
Correct answer: C) Transmittance of mineral