A concave mirror of focal length 'f' produces an image 'n' times the size of the object. If the image is real, then distance if object from mirror?

Solution
m =-v-u =IO =n  ((Since image is real and inverted))v =nu1-f =1v+1u =1nu+1u  (As mirror is concave so f is negative)-1f =n+1nuf =-nu(n+1)u=-f(n+1)nAccording to sign convention, this is the negative of the distance between object and mirror. Thus distance between object and mirror =f(n+1)n

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