# What is meant by aplanatic?

## What is meant by aplanatic?

: free from or corrected for spherical aberration an aplanatic lens.

What is an aplanatic lens used for?

An aplanatic lens is designed to minimize two monochromatic wavefront errors, called spherical aberration and coma.

### What do you mean by aplanatic lens?

An aplanatic lens is a lens that is free of both spherical and coma aberrations. Aplanatic lenses can be made by combining two or three lens elements. A single-element aplanatic lens is an aspheric lens whose surfaces are surfaces of revolution of a cartesian oval.

What is meant by spherical aberration?

In technology of photography: Aberrations. Spherical aberration is present when the outer parts of a lens do not bring light rays into the same focus as the central part. Images formed by the lens at large apertures are therefore unsharp but get sharper at smaller apertures.

#### What is the definition of splenetic?

1 archaic : given to melancholy. 2 : marked by bad temper, malevolence, or spite.

What is meant by Aplanatism in physics?

aplanatism (uncountable) (optics) Freedom from spherical aberration.

## How do you calculate the power of a lens?

The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.

What are aspheric lenses used for?

Aspheric lenses allow optical designers to correct aberrations using fewer elements than conventional spherical optics because the former gives them more aberration correction than multiple surfaces of the latter.

### What does aspherical lens mean?

An aspheric lens or asphere (often labeled ASPH on eye pieces) is a lens whose surface profiles are not portions of a sphere or cylinder. The asphere’s more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, compared to a simple lens.

What causes spherical aberrations?

Spherical aberration occurs when incoming light rays pass through lenses with spherical surfaces and focus at different points on a camera’s sensor. Light rays that pass through spherical surfaces near the horizontal axis (paraxial rays) refract less than rays that pass closer to the edge (peripheral rays).

#### What are the different types of aberration?

When light of only a single wavelength is present, there are five aberrations to be considered, called spherical aberration, coma, astigmatism, curvature of field, and distortion.

What does stanchion mean in English?

1 : an upright bar, post, or support (as for a roof or a ship’s deck) 2 : a device that fits loosely around the neck of an animal (such as a cow) and limits forward and backward motion (as in a stall)

## Which is the best definition of aplanatic lens?

Definition of aplanatic : free from or corrected for spherical aberration an aplanatic lens : free from or corrected for spherical aberration an aplanatic lens

Is the word aplanatic in the Merriam Webster Dictionary?

“Aplanatic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aplanatic. Accessed 2 Jun. 2021. Get Word of the Day daily email! Test your knowledge – and maybe learn something along the way. Anagram puzzles meet word search.

### How are aplanatic optics used in a telescope?

Aplanatic optics are designed to eliminate both spherical aberration and coma, two major aberrations (image defects) found in telescopes. The end result is sharper images across a much wider field of view than in other designs.

What happens if you substitute an aplanatic lens?

Trying to substitute one for the other based solely on price or availability could produce disturbing results. An aplanatic lens is designed to minimize two monochromatic wavefront errors, called spherical aberration and coma.