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What are the characteristics of the image formed by the concave lens of focal length 30cm, when the object is 0cm away from it? What will be the power of

this lens?

It's from class XIII.



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A virtual image of the same size almost - may be formed very close to the object distance itself. image is perhaps erect
 power of lens = 1/f = 100/30 =  3.3 dioptre
u and v are very smalll and close to 0.  v = 0  u=0  f = 30cm

0 0 0
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