Q. 194.7( 20 Votes )

A concave lens of

Answer :

Here, Object distance, u = ? (To be calculated)

Image distance, v =- 10 cm (To the left of concave lens)


Focal length, f =- 15 cm (It is a concave lens)


Now, putting these values in the lens formula:




Putting the values  of v and f in the above equation, we get



Object distance, u = -30 cm


Thus, the object is placed at a distance of 30 cm from the concave lens. The minus sign with object distance shows that the object is on its left side. The diagram is shown as:


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