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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Mar 2008 10:04:48 IST
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does +ve value of power always mean the usage of a convex lens??
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5 Mar 2008 11:36:33 IST
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not always i think.....coz it can be a combination of 2 lenses........a concave and a convex lens.......sometimes this combination can give a positive power depending on their focal lengths
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5 Mar 2008 23:39:22 IST
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suerly if only 1 lense used then its convex (if external medium has a refractive index less than that of the lense....otherwise its character is reversed)
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5 Mar 2008 23:48:11 IST
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a positive value of power indicates the converging of light.....
any optical setup that converges light has a positive power.....
that means evn a concave mirror has a positive power.....
and if it is mentioned that a lens is used,then surely its nature also depends on the nature of the surrounding media....
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"Many of the things you can count,dont count....
Many of the things you cant count,really do count...."-Albert Einstein
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6 Mar 2008 00:07:44 IST
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a positive value means tht incident light is getting converged.....
so this can happen if the combination of two or more lenses.....
due to single convex lens or wen u have convex lens and the refractive index of the med present outside has a refractive index larger thn of the material of which the lens is made...
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6 Mar 2008 15:02:53 IST
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+P means a converging lens (not necessarily convex) or a converging combination of lenses.
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"A perfect mind is a treasure unsurpassed."
"It is said that human beings have 5 senses. That's because most of them lack the 6th - common sense."
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6 Mar 2008 15:08:20 IST
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P=-v/u
for positiv P
v and u shd be off opposite signs..
so the obj and img lie on opp sides
so for any lens combination givin real images this is true
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