1.

If f is focal length and u is object distance for spherical mirror, then lateral magnification m = ......

Answer»

`(f)/(u-f)`<BR>`(f)/(u+f)`
`(f)/(f-u)`
`(f-u)/(f)`

Solution :For SPHERICAL MIRROR,
`1/f=1/u+1/v implies 1/f-1/u=1/v`< br>`therefore (u-f)/(fu)=1/v`
`therefore(u-f)/(f)=u/v`
`-v/u=-((f)/(u-f))therefore m=(f)/(f-u)`


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