CBSE Class 12-science Answered
Please answer the question on double convex lens
Asked by | 22 Jun, 2008, 08:09: PM
Expert Answer
Focal length of lens,1/f=(1/r)-(-1/r)=2/r
Or f =r/2
When it is cut the focal length,1/f1=(1/r)
or f1=r=2f
Hence focal length of each part gets doubled and becomes 2f.(Upper or lower cuts do not affect the focal length)
Answered by | 22 Jul, 2008, 10:07: PM
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