We study entanglement dynamics in a dispersive optomechanical system consisting of two optical modes and a mechanical oscillator inside an optical cavity. The two optical modes interact with the mechanical oscillator. but not directly with each other. The appearance of optical entanglement witnesses nonclassicality of the oscillator. https://www.bekindtopets.com/hot-sale-Saddle-Seat-Size-Shrinker-great-price/