Photosensitive is the adjective used to denote something is sensitive at light.
The etymology of the word is determined in the following manner:

Photo: this is a greek radical that means, literally, light. Also referred as Phos sometimes.
Sensitive: that's obviously obvious, a modern poet shall say. Yes, it is a relation to sensitivity.

Furthermore, photosensitive is the quality of a glass to suffer permanent physical-chemical transformations. These are oxide-reductional reactions mainly induced by ultraviolet radiation.

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