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## Homework Statement

Light of wavelength 473 nm falls on two

slits spaced 0.389 mm apart.

What is the required distance from the slit

to a screen if the spacing between the first and

second dark fringes is to be 6.71 mm?

Answer in units of m.

## Homework Equations

sin[tex]\theta[/tex]= m[tex]\lambda[/tex]/d

x=tan[tex]\theta[/tex]*L

## The Attempt at a Solution

[tex]\theta[/tex] = sin

^{-1}{2*473e-9m / .389e-3 m} = .139336 degrees

L = 6.71e-3 m / tan .139336 = 2.75919