The focal length of a convex mirror is considered:
Q1. The focal length of a convex mirror is considered:
Answer: Negative and virtual
Explanation: In the New Cartesian sign convention, a convex mirror has a negative focal length because its principal focus lies behind the reflecting surface on the same side as the object, making it a virtual focus. This virtual focus is why convex mirrors always form diminished, upright, virtual images regardless of object position.