A concave lens of focal length 15 cm forms an image 10 cm forms the le – InterviewSolution

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1.	A concave lens of focal length 15 cm forms an image 10 cm forms the lens. How far is the object placed from the lens? Draw the ray diagram.
Answer» Solution :f=-15cm,v=-10cm,u=? `1/f=1/v-1/u` `1/u=1/v-1/f=(f-v)/(fv)` `u=(fv)/(f-v)=((-15)xx(-10))/(-15-(-10))=150/(-5)=-30CM` `u=-30cm`

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