A concave lens of focal length 15cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw ray diagram.
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`h_(1)=12m= 1200cm, h_(2)= -12cm, u= -15m= -1500cm` v= ? `m= (v)/(u)= (h_(2))/(h_(1))` `(v)/(-1500)= (-12)/(1200)= - (1)/(100)` `v= (1500)/(100)= 15cm` So screen should be placed at a distance of 15cm from the pin hole.
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