कंप्यूटर द्वारा आँखों की जांच
नजर व धूप के चश्मे
कंप्यूटर द्वारा आँखों की जांच
नजर व धूप के चश्मे
Optical or optical technology refers to anything relating to light or vision, whether it be visible light or infrared light, that performs a specific function. For example, optical fiber, like that shown to the right is a type of wire commonly made out of glass or plastic that carries light signals
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