1.

A beam of light passing through a diverging lens of focal length 0.3 m appear to be focused at a distance 0.2 m behind the lens. Find the position of the object.

Answer»

SOLUTION :f=- 0.3 m ,v =-0.2 m
`(1)/(f)=(1)/(v)-(1)/(u)`
`(1)/(u)=(1)/(v)-(1)/(f)`
`(1)/(u)=(1)/(-0.2)-(1)/(-0.3)`
`=(-10)/(6)`
`u=(-6)/(10)=-0.6m`


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