- #1

- 142

- 0

## Homework Statement

A piece of paper is placed at the end of an air wedge 4 cm long. Interference fringes appear when the light of wavelength 639 nm is reflected from the wedge. A dark fringe occurs at both the vertex of the wedge and at its paper end, and 56 bright fringes appear between. Calculate the thickness of the paper.

## Homework Equations

delta X = L (lambda / 2t)

where t is the thickness of the paper

lambda = wavelength

l = length of air wedge

X = distance between fringes.