PART A

A lens with two convex surfaces, both with radii of curvature of0.25 meters, is used to focus light. If the lens is made of crownglass, it would have an index of refraction for red (656 nm) lightof 1.509 and for blue light (486 nm) of 1.517. What happens when itis used to make an image of a distant source of white light? Pickthose that apply (THERE ARE 3 ANSWERS)

		The red light falls in a cone outside the blue light as it thelight converges to a focus, so when blue is in focus there is afuzzy red ring around it.
		The blue light focuses closer to the lens than the redlight.
		When the red light is in focus it is surrounded by a bluehalo.
		The red light focuses closer to the lens than the bluelight.

PART B

Energy carried by light..... Pick ALL thatapply

		is proportional to both electric and magnetic fields
		is proportional to the square of the electric field
		is proportional to the amplitude of the electric field
		flows perpendicular to both the electric and the magneticfields
		flows in the direction of the electric field

PART C

Suppose you are experimenting with a Michelson interferometerand you have adjusted it so that you see a pattern of circularrings of interference. You illuminate the interferometer with lightfrom sodium atoms which emit two wavelengths, 589 and 596 nm. Whatdo you see?  Pick ALL that apply. (thereare multiple answers)

		For the same order of interference, the rings from the longerwavelength light fall inside the rings of the shorter wavelengthlight.
		For some spacings of mirrors, the rings from the two lines mayfall exactly between one another.
		There are no rings visible because there are two wavelengthspresent.
		You could adjust a mirror to make the rings of the twowavelengths lie on top of one another, and then change it to makethem lie between one another.
		The difference is so small that the rings from both wavelengthsalways lie on top of one another.