A crime scene investigator wants to use a forensic lamp to look for particles on a carpet at a crime scene. Which technique will she use to find the particle evidence

She will use the principle of luminescence of material under a particular wavelenght of light.

Explanation:

The forensic lamp is used to locate evidence that would usually be invisible to the naked eye.

Forensic lamp produces light at a specific wavelength of the electromagnetic spectrum (usually ultraviolet, blue or green).

Certain substances (usually biological based like saliva, semen, etc.) will glow under the forensic lamp in a phenomenon known as 'fluorescence'. Fluorescence occurs when a molecule absorbs light of a particular wavelength and then emits a different coloured light back.