This is the optical cloak (one of the designs) proposed by Howell. What is the angle of the light in water. How big is the cloaking region if the refractive index is 1.33. Explain how the design can be improved in terms of the angle of the water prisms, the thickness x, and the refractive index. Water t Cloaking Region Water Light is to be totally internally reflected by the prism of Fig. 3-21. Determine the corresponding minimum index of refraction of the prism if it is to be imbedded in air. Explain how the critical angle changes when the prism is instead embedded in water. Repeat the problem for another angle that is not 45 degrees.