[Solved] The graph in the figure shows the velocity of a particle as it travels along the x-axis. What is the magnitude of the average acceleration of the particle between t = 1.0 s and t = 4.0 s? Specimen Slide: A thin glass plate used to hold objects for examination under a microscope. Light Source: An object or device that emits light, used for illumination or visualization. Ocular: Pertaining to the eye or vision, involving the anatomy and function of the eye. Microscope: An instrument used to see objects that are too small for the naked eye.