a concave lens of focal length 15cm form on image 10cm from the lens. How far is the object placed from the lens?
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Given,
focal lenght,f= -15cm
Distance of image,v= -10cm
Distance of object, u=?
we know that,
1/v - 1/u=1/f
so,
1/-10 -1/u=1/-15
so,-1/10+1/15=1/u
(-3 + 2)/30=1/u
-1/30=1/u
Therefore u= -30 cm
Thus object is placed 30cm away from the concave lens.
Negative sign shows that object is at 30cm in front of the lens.
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