Optics/Lenses

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  • Holding a magnifying glass against a wall at the proper distance usually will provide a picture of the lit-up parts of the room. Note that that distance varies, depending on the distance of the object concerned from the lens. Objects that are far away will require a distance called the focal length, while objects that are closer to the lens require a longer distance for a sharp picture of that object on the wall.
  • Eye glasses restore proper sight to very many people, also eyepieces of optical instruments include lenses.
  • Photography has many uses

See also wikipedia: List of many optics topics

Refraction at a spherical interface[edit]

See also wikipedia:Refraction

A lens[edit]

Locating the image[edit]

See also

The lensmaker’s equation[edit]

See also

Converging and diverging lenses[edit]

See also

See also[edit]