Define aspheric lensvs asphericallens

Sign convention : - All distances are measured in relation to the lens surface. - The direction of light from object to lens is considered as the 'positive direction' (always from left to right). - The focal length is positive (f > 0) for a converging lens and negative (f < 0) for a diverging lens.

Aspheric lensglasses

The purpose is to calculate the position of the image of an object which is 20 cm away from a converging lens. We suppose that the lens focal length is 5 cm. So we have, - Object distance: d0 = 20 cm (directional distance from object to lens). - Focal length: f = 5 cm (positive for a converging lens) We get (enter "x" in d1 field), d1 = 6.67 cm

d0 : distance from object to lens in cm (directional distance AO in the diagram) d1 : distance from lens to image in cm (directional distance OA' in the diagram) f : focal length in cm (OF' in the diagram) All these distances obey the sign convention below.

Asphericlenses advantages disadvantages

This tool is a thin lens formula calculator. It computes the image position of an object through a thin lens. All distances are measured from the center of the lens and obey a sign convention (see below).

“Aspheric.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aspheric. Accessed 11 Nov. 2024.

The image is a virtual image (can not be seen on a screen) located 4 cm to the left of the lens. See also Newton conjugation relationshipLens optical powerOptics Calculators

To compute the position of the object by taking the lens focal points as origins, use this version Newton's version of thin lens equation.

Under the same conditions as above (converging lens case) but with a diverging lens, we have, - Object distance : d0 = 20 cm. - Focal length : f = -5 cm (negative sign for a diverging lens) We get (enter "x" in d1 field), d1 = -4 cm