Image Formation By Convex MirrorThe image formed in a convex mirror is always virtual and erect, When an object is placed at infinity, a virtual image is formed at the focus. The size of the image is diminished. When an object is placed at a finite distance from the mirror, a virtual image is formed …
Image Formation By Concave MirrorBy changing the position of the object from the concave mirror, different types of images can be formed. Different types of images are formed By Concave Mirrors when the object is placed (i) At infinity,(ii) Beyond the centre of curvature,(iii) At the centre of curvature,(iv) Between the centre of curvature and …
Uses of Concave MirrorSatellite DishesThese are used to capture and enhance the weaker signals that the communication satellites send. These impulses are reflected after striking the concave mirror in parallel rays. The mirror focus is the focal point of these reflected rays. This mirror’s primary function is to concentrate weaker signals coming from wide areas into …
The intersection of at least two reflected rays gives the position of image the of the point object. Any two of the following rays can be considered for locating the image.(i) A ray parallel to the principal axis, after reflection, will pass through the principal focus in case the of a concave mirror or appear …
Important term for concave mirror : (a) Pole: The centre of a spherical mirror’s reflecting surface is called the pole.It lies on the surface of the mirror and it is denoted by P.(b) Center of curvature: The centre of the sphere formed by a spherical mirror’s reflecting surface is known to as the centre of …
Position of image: Between Pole and FocusSize of image: DiminishedNature of image: Virtual and erect.
D at the focus of the mirror. From a concave mirror, if an object is at infinity, parallel light rays will converge at focus after reflection. As a result, the formed image is what the mirror is focused on.
Power of lens (P) = 1/focal length [f (in m)] P = 1.5D f = 1/1.5 = 10/15 = 0.66 m A convex lens has a positive focal length. Therefore, it is a convex lens or a converging lens.
Power of lens (P) = 1/focal length [f(in m)] P = -2D f = -1/2 = -0.5 m A concave lens has a negative focal length. Therefore, it is a concave lens.
The negative value of image height indicates that the image formed is inverted.
