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Types of Lenses

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Convex Lens (Converging)

Focal Length: Positive, Application: Used in eyeglasses for far-sightedness

Concave Lens (Diverging)

Focal Length: Negative, Application: Used in eyeglasses for near-sightedness

Cylindrical Lens

Focal Length: Can be Positive or Negative, Application: Used to correct astigmatism in eyeglasses

Fresnel Lens

Focal Length: Positive, Application: Used in lighthouses and overhead projectors

Plano-Convex Lens

Focal Length: Positive, Application: Used in laser systems to focus light beams

Bi-convex Lens

Focal Length: Positive, Application: Used in magnifying glasses and eyepieces

Plano-Concave Lens

Focal Length: Negative, Application: Used in optical instruments to expand light beams

Bi-concave Lens

Focal Length: Negative, Application: Used in optical devices that control beam size

Meniscus Lens

Focal Length: Can be Positive or Negative, Application: Used in corrective eyewear and camera lenses

Telephoto Lens

Focal Length: Positive, Application: Used in photography to get close-up images of distant objects

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