Chapter 25 the reflection of light: mirrors. Imagine a small, spherical object emitting sound waves. Those waves will come out in spherical (cid:858)shells(cid:859) to p(cid:396)ese(cid:396)(cid:448)e (cid:396)adial s(cid:455)(cid:373)(cid:373)et(cid:396)(cid:455). If those shells (cid:271)e(cid:272)o(cid:373)e la(cid:396)ge(cid:396) a(cid:374)d la(cid:396)ge(cid:396), the(cid:374) thei(cid:396) su(cid:396)fa(cid:272)e will look flatter and flatter, in the same way that the sun will look flatter than the earth. We can approximate a curved wavefront with its tangent surface a plane wave: alternatively, you could choose to approximate these with rays basically a direction! 25. 2 the reflection of light: most objects reflect a ce(cid:396)tai(cid:374) po(cid:396)tio(cid:374) of the light falli(cid:374)g o(cid:374) the(cid:373) (cid:894)(cid:449)hi(cid:272)h is (cid:449)h(cid:455) the(cid:455)(cid:859)(cid:396)e (cid:448)isi(cid:271)le, after all). Suppose that a ray shines on a flat, shiny surface like a mirror. If it shines onto it at an angle of incidence (the angle away from the normal to the surface), then it will be reflected by the same angle (this time called the angle of reflection)