1.

Distance between divergent lens and object is m times than focal length. Linear magnification of lens is ......

Answer»

m
`1/m`
m+1
`(1)/(m+1)`

Solution :LINEAR MAGNIFICATION `m=v/u,u=mf IMPLIES u/f=m`
For lens,`1/f=1/v-1/u`
`therefore u/f=u/v-1[because` MULTIPLIED by u]
`thereforem=1/M-1`
`therefore1/M=m+1`
`therefore M=(1)/(m+1)`


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