Question

Which of the following optical properties cannot be measured by spectrophotometer?

(a) Gloss

(b) Haze

(c) Optical Distortion

(d) Yellowness Index

This question was posed to me in a job interview.

I need to ask this question from Optical, Mechanical Properties of Thermoplastic Polymers in portion Thermoplastic Polymers Properties & Processing of Food Packaging Technology

Answer 1

Correct answer is (a) Gloss

The explanation: Gloss cannot be measured by spectrophotometer. It is measured by a glossmeter. Gloss is an inherent property of any material. It is a measure of light reflected by the surface of a material. Rest of the optical properties is measured by spectrophotometer. Haze is produced by scattering of light when passed through a material. Optical Distort is the ability to distort light. Yellowness Index is the parameter to check the deviation of color of the material towards yellow or white.