lenses -- keka qsn

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A thin hollow equiconvex lens silvered at the back converges a parallel beam of light, at a distance of 0.2m in front of it. Where will it converge the same light, if filled with water (Âµ = 4/3).

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Lokesh Verma ·2008-12-30 06:16:05

Yesh:

I think the first case it will act as a concave mirror....
With some radius of curvature... which u will be able to find easily...

Then you will have to use a combination of one curved refracting surface with a mirror!

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yeshkadiyala ·2009-01-01 06:28:21

but why doe it act like one????

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cooljoy ·2009-01-01 07:32:15

the focal length of the silvered part=-.2m

for non silvered part apply lens maker's formula
then apply
P eq=2P l+p m

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lenses -- keka qsn

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