Questions 5 and 6 refer to a beam of light that passes through a sheet of plastic and out into the air. The angle the beam of light makes with the normal as it passes through the plastic is , and the angle the beam of light makes with the normal as it passes into the air is . The index of refraction for air is 1 and the index of refraction for plastic is 2.

5.	What is the value of sin, in terms of ?
	(A)	sin
	(B)	2 sin
	(C)	sin 2
	(D)	sin
	(E)	4 sin

6.	What is the minimum incident angle for which the light will undergo total internal reflection in the plastic?
	(A)	sin–1
	(B)	sin–1
	(C)	sin–1 2
	(D)	0º
	(E)	90º