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CBSE Class 10 Answered

please solve this
Asked by akankshyasahu | 24 Feb, 2010, 11:47: AM
answered-by-expert Expert Answer

Dear Student

Focal Length of an lens= f= uv/(u+v)

Magnification m= -v/u

For lens A

Real image formed ===> convex lens

and  m is negative and greater than one

 f= uv/(u+v)  if v is very large f is approximately u

For lens B

This is also convex lens

m=-v/u=-1   ===> v=u

f=15X15/(30)=7.5 cm

Regards

Team

Topperlearning.com

Answered by | 01 Mar, 2010, 03:58: PM

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