Activity 4 Directions: Solve for the given problems. Show your complete solutions. Express your final answers into 3 significant figures. Write your answers on another sheet of paper. 1. Light travels in air to a plastic material with an angle of incidence of 65.0. Since plastic is more optically dense than air, the refracted ray bent with an angle of refraction of 52.00. Compute for the speed of light in the plastic material. 2. Light, which has a speed of 2.00 x 10 m/s in quartz, has a wavelength of 360 nm. a. Find the refractive index of quartz in this wavelength. b. Find the wavelength of this light if it travels in air