Question

Which of the following is not a term used for defining optical property?

(a) Birefringence

(b) Yellowness Index

(c) Grammage

(d) Refractive Index

The question was posed to me in my homework.

My doubt is from Optical, Mechanical Properties of Thermoplastic Polymers in portion Thermoplastic Polymers Properties & Processing of Food Packaging Technology

Answer 1

Correct option is (c) Grammage

Explanation: Grammage is not used to define optical property. Grammage is expressed as grams per square meter and is used to express paper density. The terms used for defining optical property include – Birefringence, clarity, transmittance, reflectance, refractive index, haze, gloss and yellowness index.