A lens may have a focal length.Logical formLearned from10 sentences. A field may pertain-to a lens.Logical formLearned from10 sentences. Lens may undergo a use.Logical formLearned from10 sentences. Part may pertain-to a lens.Logical formLearned from10 sentences. A lens can be biased.Logical formLearned from10 sentences. A (meniscus lens) can be negative.Logical formLearned from10 sentences. A periphery may pertain-to a lens.Logical formLearned from10 sentences. Rays may pass through a lens.Logical formLearned from10 sentences. A lens may be cleaned.Logical formLearned from10 sentences. A lens may undergo a formation.Logical formLearned from10 sentences. A lens can be powered.Logical formLearned from10 sentences. A person may use a wide-angle lens.Logical formLearned from10 sentences. A lens can be for (close-up photography).Logical formLearned from10 sentences. Lens may be worn.Logical formLearned from10 sentences. A (lens number) can be reflective.Logical formLearned from10 sentences.