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Observe the diagram which shows the path...

Observe the diagram which shows the path of an incident ray through an optical plane LL' of a lens . The focal length of the lens is 20 cm .

An object is placed in front of his lens at a distance of 60 cm . Then the image distance from the lens with proper sign convention is :

A

`+60 cm `

B

`+ 30 cm `

C

` -30 cm `

D

`+ 15 cm`

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