Question

Looking at a dark spot, the change in the optical path length difference to go to a bright spot and back to a dark spot is :

Question options:

	?/4
	?/2
	?
	2?
	4?

Question 2

What is the point of the beam splitter?

Question options:

	Create two paths for the laser light.
	Split the beam into different wavelengths.
	Change the distance from the laser to mirrors.
	Nothing; it's BS.

Question 3

Which variables need to be meassured to determine the wavelength of a laser (two answers are correct, choose one of the correct ones)?

Question options:

	L1
	?m
	L2
	?A
	??

Question 4

What is the wavelength of a Helium-Neon laser ?

Question options:

	193.0 nm
	337.1 nm
	454.6 nm
	632.8 nm
	10600 nm

Answer 1

1) Lambda/4

2) Create two paths for the laser light.

3)

4) 632.8 nm