Focal length of concave mirror is f and ratio of heights of object to image for an object at x distance from mirror is .....

Options

A. `sqrt(f/x)`
B. `f/x`
C. `(f^2)/(x^2)`
D. `(f+x)/(f)`

Answer

B

Explanation

Magnification for spherical mirror m = `(h.)/h`
`(f)/(f-u)=(h.)/h`
Here,u=f+x
`therefore(f)/(f-(f+x))=(h.)/h`
`therefore(f)/(-x)-(h.)/h`
`therefore |(h.)/h|=f/x`