CORRECT!
Again, real quantities have + values and virtual quantities have - values. A concave ) spherical mirror has its center on the side where the reflected light really goes after reflection (its left side), so R is +.
Rays parallel and close to the axis really do converge after reflection to a real focal point, so f is also +.
Also, since f = R/2, f and R must have the same sign.

Click here to return.