What are the focal length of convex lens , concave lens, and convex mirror, concave mirror??

What are the focal length of convex lens , concave lens, and convex mi

1.	What are the focal length of convex lens , concave lens, and convex mirror, concave mirror??
Answer» Lenses have two focal points,one on either side of lens. A concave mirror converges light to a focal point. For Lenses light converge to a point for a convex lens. A convex mirror diverges,as does a concave lense.