| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Apr 2007 22:09:04 IST
|
|
|
Wat is the condition 4 the elimination of chromatic abberation by an achromatic doublet??
|
|
|
|
24 Apr 2007 19:06:16 IST
|
|
|
nebody?
|
this reply: 0 points
(with 0 
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
25 Apr 2007 13:58:42 IST
|
|
|
is this a question 4m the topic lenses?
if so, i think the necessary criteria shuld be :-
1) equal refractive index
2) equal radius of curvature
|
Smoke like a chimney, work like a horse, eat without thinking, go for a walk only in really pleasant company |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
25 Apr 2007 16:48:51 IST
|
|
|
no..no...m asking abt the condition involving dispersive powers....
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
26 Apr 2007 18:31:23 IST
|
|
|
maybe because different wave lenghts of light are refracted in a different angle. therefore they do not converge at one single point in the axis
|
here's a live img of the sun:
> |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
26 Apr 2007 19:22:21 IST
|
|
|
y dont u read the Q completely??? m askin abt condition 2 eliminate chromatic abberation involvin dispersive powers.......
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
26 Apr 2007 19:49:12 IST
|
|
|
sorry! u can check this out:
http://en.wikipedia.org/wiki/Chromatic_aberration
|
here's a live img of the sun:
> |
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
4 May 2007 09:53:38 IST
|
|
|
Hi julie,
chromatic abberation cannot be removed for a single lens due to prismatic behaviour.Hence a combination of lenses is used.
IT CAN BE ELIMINATED IN FOLLOWING WAYS
1)When lenses are in contact : w1/w2= -f1/f2
2)When lenses are kept at distance: the distance should be d=(w1*f2+w2*f1)/(w1+w2)
NOTE: if lenses are of same material and nature the combination will act as achromatic doublet for d=(f1+f2)/2 with feq=f1*f2/d
Do rate me !
|
this reply: 2 points
(with 0
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
1
