(1) (2) Suppose a ray from a point light source hits a surface at a point p whose normal vector is N. Let be the unit vector from p toward the light source. Describe R, the unit_vector_at p in the direction of ideal specular reflection of the ray, in terms of and L. Continuing the previous question, let v be the unit vector at p toward the viewer. Express the intensity of specular reflection in the Phong model in terms of L, , and/or , V specular light intensity I, specular-reflection constant k, and specular-reflection exponent a, and explain what visible effect a has and why.