How Do You Spell ASPHENC LENS?
Pronunciation: [ɐsfˈɛŋk lˈɛnz] (IPA) 
Correct spelling for the English word "asphenc lens" is [ɐsfˈɛŋk lˈɛnz], [ɐsfˈɛŋk lˈɛnz], [ɐ_s_f_ˈɛ_ŋ_k l_ˈɛ_n_z] (IPA phonetic alphabet).
Pronunciation: [ɐsfˈɛŋk lˈɛnz] (IPA)
Correct spelling for the English word "asphenc lens" is [ɐsfˈɛŋk lˈɛnz], [ɐsfˈɛŋk lˈɛnz], [ɐ_s_f_ˈɛ_ŋ_k l_ˈɛ_n_z] (IPA phonetic alphabet).
There seems to be a typographical error in the term you provided, as "asphenc lens" does not appear to have an established meaning or usage in the English language. However, a related term might be "aspheric lens," which is a common term in optics. Therefore, I will provide a 200-word dictionary definition of "aspheric lens" instead.
Aspheric lens:
An aspheric lens is a type of lens that displays a non-spherical or non-circular curvature, meaning it deviates from the traditional shape of a spherical lens. Unlike spherical lenses which have a uniform curvature throughout their surfaces, aspheric lenses are designed with varying curvatures across their surfaces to improve optical performance. The main objective of using aspheric lenses is to reduce or eliminate aberrations that can distort and degrade the quality of an image or focus. By introducing aspheric surfaces, the lens can mitigate various aberrations such as spherical aberration, astigmatism, and coma, thereby enhancing focusing accuracy and image quality.
The aspheric shape of these lenses allows them to refract light more precisely, which results in improved clarity and greater resolution. Because of their enhanced optical performance, aspheric lenses are commonly used in various applications such as photographic lenses, telescopes, microscopes, and ophthalmic lenses. Additionally, aspheric lenses can also contribute to reducing the size and weight of optical systems while maintaining or improving their performance. These lenses are typically made from optical-grade materials such as glass or plastic and can be manufactured using different techniques, including molding, precision grinding, and diamond turning.
