Question

PART A

A lens with two convex surfaces, both with radii of curvature of 0.25 meters, is used to focus light. If the lens is made of crown glass, it would have an index of refraction for red (656 nm) light of 1.509 and for blue light (486 nm) of 1.517. What happens when it is used to make an image of a distant source of white light? Pick those that apply (THERE ARE 3 ANSWERS)

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

PART B

Energy carried by light..... Pick ALL that apply

		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 magnetic fields
		flows in the direction of the electric field

PART C

Suppose you are experimenting with a Michelson interferometer and you have adjusted it so that you see a pattern of circular rings of interference. You illuminate the interferometer with light from sodium atoms which emit two wavelengths, 589 and 596 nm. What do you see?  Pick ALL that apply. (there are multiple answers)

		For the same order of interference, the rings from the longer wavelength light fall inside the rings of the shorter wavelength light.
		For some spacings of mirrors, the rings from the two lines may fall exactly between one another.
		There are no rings visible because there are two wavelengths present.
		You could adjust a mirror to make the rings of the two wavelengths lie on top of one another, and then change it to make them lie between one another.
		The difference is so small that the rings from both wavelengths always lie on top of one another.

Answer 1

PART A

The blue light focuses closer to the lens than the red light.--A

since blue's refractive index is more so speed will be less and so the deviation angle is more hence blue light focuses closer to the lens than the red light.

PART B

PART C