Geometry deriving Snell s law of refraction using Fermat s principle

Let us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interface . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2 . Let us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interface . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2 Let us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interface . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2 Let us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interfacLet us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interface . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2e . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2 Let us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interface . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2 Let us illustrate how Fermat s principles can be used to drive Snll s law of refraction . Suppose that a light ray is to travel from point P in medium 1 to point Q in medium 2 , where P and Q are at perpendicular distance a and b respectively from the interface . The speed of light is ( c/n1 ) in meduim 1 and ( c/n2 ) in medium 2