Please answer the question on double convex lens

Asked by  | 22nd 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  | 22nd Jul, 2008, 10:07: PM

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