Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details
Get extra R 700 off


how do we discuss chromatic abberation?

6 years ago


Answers : (1)


Dear Chinmaya,

In optics, chromatic aberration (CA, also called achromatism or chromatic distortion) is a type of distortion in which there is a failure of a lens to focus all colors to the same convergence point. It occurs because lenses have a different refractive index for different wavelengths of light (the dispersion of the lens). The refractive index decreases with increasing wavelength.

Chromatic aberration manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image, because each color in the optical spectrum cannot be focused at a single common point. Since the focal length f of a lens is dependent on the refractive index n, different wavelengths of light will be focused on different positions.

Chromatic aberration can be both axial (longitudinal), in that different wavelengths are focused at a different distance from the lens, different points on the optical axis (focus shift); and transverse (lateral), in that different wavelengths are focused at different positions in the focal plane (because the magnification of the lens also varies with wavelength; indicated in graphs as (change in) focus length). The acronym LCA is used, but ambiguous, and may refer to either longitudinal or lateral CA; for clarity, this article uses "axial" (shift in the direction of the optical axis) and "transverse" (shift perpendicular to the optical axis, in the plane of the sensor or film).

These two types have different characteristics, and may occur together. Axial CA occurs throughout the image, and is reduced by stopping down (this increases depth of field, so though the different wavelength focus at different distances, they are still in acceptable focus). Transverse CA does not occur in the center, and increases towards the edge, but is not affected by stopping down.

Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation.

Win exciting gifts by answering the questions on Discussion Forum..

6 years ago

Post Your Answer

Other Related Questions on Wave Optics

Which colour gets relatively more dispersed? (Ray optics)
SAIMANIKANTA one year ago
Geometrical optics , or ray optics , describes light propagation in terms of rays . The ray in geometrical optics is an abstraction or instrument is useful in approximating the paths along...
KING 4 months ago
VIOLET is the colour gets relatively dispersed and it is a part in optics . Geometrical optics , or ray optics , describes light propagation in terms of rays . The ray in geometric optics...
SAI SANDY 10 months ago
Derive the image distance by using mirror in finding this.
pls post complete ques
Nishant Vora one month ago
Write the second law of reflection?
The angle of incident is equal to angle reflection.
Gavvala Ganesh one year ago
First Law of Reflection : The incident ray, the reflected ray, and the normal all lie on the same plane. Second Law of Reflection : The angle of incidence is equal to the angle of...
SHANMUKESHWAR one year ago
Light is known to behave in a very predictable manner. If a ray of light could be observed approaching and reflecting off of a flat mirror, then the behavior of the ...
venky one year ago
short note on ohmic and non ohmic substances with proper example
@kishor ohmic substances – these are purely conducter which obey ohms law at every temp , and pressure range . temp and pressure are kept as low and constant here . example – copper ,...
Umakant biswal one month ago
A body starting from rest moves with constant accleration. The ratio of distance covered by the body during the 5th second to that covered in 5 second is
Distance covered in n th second is given by s n = u + a/2(2n-1) where u – intial velocity and a – acceleration Distance covered in t seconds is given by s = ut + a/2(t 2 ) But, here u = 0...
Adarsh 3 months ago
HERE ‘U’=0, HENCE THE DISTANCE COVERED UPTO 5 th second is=1/2at^2=(25a)/2. and theTHE DISTANCE COVERED UPTO 4th second is=1/2a(4 2 )=8a. and ths distance travelled in 5 th...
Gosula Madhukar one month ago
View all Questions »

  • Complete Physics Course - Class 12
  • OFFERED PRICE: R 2,600
  • View Details
Get extra R 650 off

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details

Get extra R 700 off

More Questions On Wave Optics

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details