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CBSE Class 10 Answered

The  image  obtained  with a convex  lens is erect and its  length is 4 times the length of the object.  If the  focal length  of the  lens is 20 cm, calculate  the object and image  distance
Asked by sisugsgsgsysyhshz | 09 Jun, 2017, 01:18: PM
answered-by-expert Expert Answer
begin mathsize 12px style Given space that straight f space equals space 20 space cm Magnification space straight m space equals space straight v over straight u space equals space 4 rightwards arrow straight v space equals space 4 straight u Using space the space lens space formula comma 1 over straight f space equals space 1 over straight v space minus space 1 over straight u 1 over 20 space equals space fraction numerator 1 over denominator 4 straight u end fraction space minus space 1 over straight u 1 over 20 space equals space fraction numerator 1 space minus space 4 over denominator 4 straight u end fraction or space 4 straight u space equals space minus space 60 therefore space straight u space equals space minus 15 space cm rightwards arrow straight v space equals space 4 straight u space equals space space minus 60 space cm end style
Answered by Yashvanti Jain | 09 Jun, 2017, 02:42: PM

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