age of an object formed by a lens is ofItmagnification -1. If the dist

1.	age of an object formed by a lens is ofItmagnification -1. If the distance betweenthe object and its image is 60 cm, what isthe focal length of the lens? If the object ismoved 20 cm towards the lens, wherewould the image be formed? State reasonand also draw a ray diagram in support ofCBSE 2016your answer
Answer» Magnification,m= -1Distance between object and image, u + v = 60 cm Magnification (m) is given bym=vu⇒−1=vu⇒v=−u Now, we have,−u+v= 60⇒−u−u=60⇒−2u=60⇒u=−30cmSo,v=−(−30)=30cmUsing lens formula1v−1u=1f⇒1f=130−1−30=230⇒1f=115⇒f=15cm

age of an object formed by a lens is ofItmagnification -1. If the distance betweenthe object and its image is 60 cm, what isthe focal length of the lens? If the object ismoved 20 cm towards the lens, wherewould the image be formed? State reasonand also draw a ray diagram in support ofCBSE 2016your answer

Answer»

Magnification,m= -1Distance between object and image, u + v = 60 cm

Magnification (m) is given bym=vu⇒−1=vu⇒v=−u

Now, we have,−u+v= 60⇒−u−u=60⇒−2u=60⇒u=−30cmSo,v=−(−30)=30cmUsing lens formula1v−1u=1f⇒1f=130−1−30=230⇒1f=115⇒f=15cm

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