|
|
|
|
|
| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 10 May 2007 11:31:03 IST
Accepted Answer [?]
![[Up]](/templates/default/images/icon_up.gif "[Up]")
|
|
|
Hey dude! The focal length of mirror remains d same. i does not depend on the refractive index but just d curvature.
f = R/2
Remembered!
n 4 d lens using lens makers formula
1. for radii of curvatures (let it be biconvex lens)
1/3 = (1.5 - 1)(1/R - 1/-R)
1 = 1.5(2/R)
R = 3 cm
2. for lens in medium
1/f = (1.5/2 - 1)(1/3 - 1/-3)
= -0.25(2/3)
f = -6 cm which indicates dat it acts as diverging lens which is true.
3. if it is biconcave lens then 1st step is same exept 4 signs and R = -3
n fconcave = 6 cm which acts as converging lens
pls rate me if correct
|
 
Being beaten is often a temporary condition, giving up is what makes it permanent. |
this reply: 5 points
(with 1 
in 1 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
|
|
|
|
|
Moderation Team
