The image formed by a convec mirror of focal length 30 cm is a quarter the size of the object what is the distance of the obect from the mirror?

Explanation

f = 0.3, m = `(v)/(u) = (1)/(4) , " " v = (u)/(4) , u = ? `
`(1)/(f) = (1)/(u) + (1)/(v) " " (1)/(0.3) = (1)/(u) + (1)/((u)/(4)) = (1)/(u) + (4)/(u) = (1 + 4 )/(u ) `
u = 1.5 m