A contact lens is made of plastic with an index of refraction of 1.38. The lens has an outer radius of curvature of 2.08 cm and an inner radius of curvature of 2.58 cm. What is the focal length of the lens

Consider the phase change taking place in the picture. you could use all but one statement to describe what is happening here. that is: a) temperature is increasing. b) kinetic energy is increasing. c) the space between the particles remains the same. d) the attractive force between the particles is decreasing.