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Focal Length

For a thin double convex lens, all parallel rays will be focused to a point referred to as the principal focal point. The distance from the lens to that point is the principal focal length f of the ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/foclen.html#c1

Focal length of diverging lens

Animation enables the object position, in front of a diverging lens, to be altered. Exercise to calculate focal length, no check on answer.

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http://webphysics.davidson.edu/applets/Optics/prb9.html

Concave mirror

Problem to find the focal length of a concave mirror from a ray diagram. Object position can be altered.

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http://webphysics.davidson.edu/applets/Optics/prb1.html

Convex mirror

Problem to find the focal length of a convex mirror from a ray diagram. Object position can be altered.

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http://webphysics.davidson.edu/applets/Optics/prb1.html

Thin Lens and mirrors

A ray diagram to show image formation with thin lenses or mirrors. The focal length and object distance can be changed.

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http://www.phy.ntnu.edu.tw/~hwang/Lens/lens_e.html

Converging lens

Animation enables the object position, in front of a converging lens, to be altered. Exercise to find the focal length, no check on answer.

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http://webphysics.davidson.edu/applets/Optics/prb8.html

Online Depth of Field Plotter

Nicholas Sushkin' s online calculator will compute the depth of field for a photographic instrument given the focal length and the f-stop data.

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http://www.dof.pcraft.com/dof-frames.cgi

Fresnel Lens

Faced with the need to construct a large lens for a lighthouse of appropriate focal length, but unable to support the large weight of a double convex lens of that size, French physicist Augustin ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/fresnellens.html#c1

Real Image Formation

If a luminous object is placed at a distance greater than the focal length away from a convex lens, then it will form an inverted real image on the opposite side of the lens. The image position may ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/image.html#c1

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