1.

A convex mirror of focal length f produces an image (1)/(n) of the size of the object. The distance of the object from the mirror is:

Answer»

(n-1) F
`((n+1)/(n))f`
(n - 2) f
(n - 3) f

Solution :(a) `(1)/(u) + (1)/(V) = (1)/(f) , m = (I)/(O) = (v)/(u) = (1)/(n)`
`THEREFORE v = (u)/(n)`
`(1)/(f)=(1)/(v)+(1)/(u)=(n)/(u)+(1)/((-u))=(n-1)/(u)`
`therefore f = (u)/(n-1), therefore u = (n-1) f`.


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