An object is placed at a distance of 30 cm from a converging lens of focal length 15 cm. A normal eye (near point 25 cm, far point infinity) is placed close to the lens on the other side. (A) Can the eye see the object clearly? (B) What should be the minimum separation between the lens and the eye so that the eye can clearly see the object? (C) Can a diverging lens, placed in contact with the converging lens, help in seeing the object clearly when the eye is close to the lens?

Given data-


Distance of object, u = -30 cm


Focal length, f = 15 cm


We need to calculate distance of Image ,v


Using lens formula








No, if the eyes are placed close to the lens, it won’t be able to


see image clearly


(b) The eye should be placed 30 cm away from the lens to see the object clearly.
(c)If a diverging lens is used in contact with converging lens, the image formed will be at large distance , and hence the image can’t be seen.


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