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![[Post New]](/templates/default/images/icon_minipost_new.gif) 9 May 2007 12:55:35 IST
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The focal length of a spherical mirror (either concave or convex)is 3cm, it is kept in a liquid of refractive index 2, what is its new focal length? If the spherical mirror in the latter case is replaced by spherical lens, what will be the focal length of the lens in the liquid?
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God has given you one face, and you
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~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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9 May 2007 20:33:43 IST
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This is a simple applicaion of Lens maker's formula try it out!!!!If u dont get the answer nudge me!!!
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Life Ka fundaa hai
Jiyo aur jino do |
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10 May 2007 06:25:37 IST
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we cannot use lens makers formula...............since it is a mirror.........here we have to with the usual derivation
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10 May 2007 09:51:11 IST
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Ohsorryi thot it was lens my mistake!!!i ws asked same qs in Boards VVIVa i replied f does not change and that ws right so i think f wont change but image formation will change!!!
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Life Ka fundaa hai
Jiyo aur jino do |
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10 May 2007 10:57:16 IST
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Can somebody give the correct answer???
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God has given you one face, and you
make yourself another.
~William Shakespeare
You were born an original. Don't die a copy.
~John Mason |
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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
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14 May 2007 04:50:31 IST
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good work,got a new idea............that mirrors focus is const.thanks
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