1.

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​

Answer»

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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