1.

A concave lens of focal lenght 20cm from 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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