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![[Post New]](/templates/default/images/icon_minipost_new.gif) 13 Apr 2008 08:34:11 IST
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Que. - An object is kept at a distance from lens of power 10D which forms a virtual image at distance of 5cm from the lens. Calculate the distance at which the object is placed.
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Ankur
http://www.krazzyankuriit.co.cc/ |
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13 Apr 2008 09:48:03 IST
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given power = 10D ..
so focal length becomes 10cm..
now it can either be convex or concave...so take focal length
.... +/-10..
now apply lens formula ...
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Don't Dream ..Do the dream...
Rock On ....
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13 Apr 2008 11:12:24 IST
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answer is -10/3 for convex lens and -5 for concave lens
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13 Apr 2008 11:40:11 IST
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| P | = 10 D
P = 10 ( convex ) or P = -10 ( concave )
P = 1/f
f = 1/10 m = 10 cm (convex)
OR f= 1/-10m = -10cm (concave)
convex lens
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mirror formula
u is unknown
v = -5 ( its a lens )
f = 10
u = -10/3
concave lens
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mirror formula
u is unknown
v = -5 ( its a lens )
f = -10
u = -5
thats the answer
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