Question

An object of height 6 cm is placed perpendicular to the principal axis of a concave lens of focal length 5 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 10 cm.

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Solution
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Given :     cm               cm                 cm

Using lens formula :      

                   

 cm     (- sign shows that image is virtual)

Also  

                  

cm   (+ sign shows that image is erect)

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