Converging lens b This drawing of principle rays for a convex lens is based on the two facts: 1. A ray through the center of the lens is not deflected. 2. Aray entering or leaving the lens parallel to the optical axis goes through the focal point. Match the variables (a-e) in the figure with the corresponding optical variables: f = focal length ho = object height hị = image height do = object distance d; = image distance %3D %3D

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Angular speed, acceleration and displacement

Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.

Angular Position

Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.