A Michelson interferometer is illuminated with Argon laser light at 514.5 nm, an

ID: 2109137 • Letter: A

Question

A Michelson interferometer is illuminated with Argon laser light at 514.5 nm, and the

Haidinger fringe pattern is photographed with a camera using a lens of focal length

55.0 mm. The diameters of two adjacent bright circular fringes in the image are

measured to be 1.53 mm and 2.62 mm.

(a) How far would the mirror that is further away from the beamsplitter need to be

moved in order to set the interferometer at zero path difference?

my answer = 2.75mm

(b) How far and in what direction would this same mirror need to be moved from

its original position in order to shrink the 1.53 mm diameter fringe in to the centre of

the fringe pattern?

but how do i work out question b? :(

plz repost it

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