Question

hey! which among the following is negatives or positive in concave and convex mirror
1) focal length
2)image distance

Answer 1

concave mirror focal length is negative
and image distance is negative but when object is between F & P image distance is positive

Answer 2

In concave,

1)The sign of focal length is negative.

2)The sign of image distance is mostly negative but there is only one chance it becomes positive, when the object is placed between the pole and focus.

So, the sign of image distance is either positive or negative..

In convex mirror.

1) the sign of focal length is positive.

2) the sign of image distance is positive.

I hope it will help you more...