Question

name the spherical mirror which have positive focal length​

Answer 1

Answer:

The focal length (f) of a concave mirror is considered negative and for convex mirror it is positive. Height of an object is always considered positive. If an image is formed above the principal axis, its height is taken as positive and if below the principal axis then it is taken as negative.

Explanation:

f, the focal length, is positive for a concave mirror, and negative for a convex mirror. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright.