1.

For thin convex lens if magnification is one then object distance and image distances are .....

Answer»

F,f
f,2f
2f,f
2f,2f

Solution :MAGNIFICATION for lens m =`v/U` but m=1
`thereforev=u`
`therefore1/f=1/v-1/u`[TAKING v=u and u negative]
`therefore1/f=1/v+1/u`
`therefore1/f=2/v`
`therefore v=2f thereforeu=2f`


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