Pages: 1 2 All. Dialectical behavior therapy (DBT) is a specific type of cognitive-behavioral psychotherapy developed in the late 1980s by psychologist Marsha M. Linehan to help better treat borderline personality disorder.Since its development, it has also been used for the treatment of other kinds of mental health disorders.ialectical behavior therapy (DBT) treatment is a cognitive-behavioral approach that emphasizes the psychosocial aspects of treatment.
The focal length of the mirror is simply the distance between and . As is easily demonstrated, in the paraxial approximation, the focal length of a convex mirror is half of its radius of curvature. There are, again, two alternative methods of locating the image formed by a convex mirror. The first is graphical, and the second analytical. An incident ray which is parallel to the principal axis is reflected as if it came from the virtual focus of the mirror.
The image formed by a concave lens is virtual, meaning that it will appear to be farther away than it actually is, and therefore smaller than the object itself. Log in to see link for more information. Added 4/10/2014 11:47:04 PM. This answer has been confirmed as correct, not copied, and helpful.