a concave lens of focal length 20cm forms and image at the distance of 10cm from the lens what is the distance of the object from the lens
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Answer:
Given f = - 20 cm, (sign convention) , v = - 10 cm
(∴ image formed by concave lens is virtual)
By using lens formula,
or u = - 20
Thus the object is placed at 20 cm from the concave lens
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