- #1

seanmcgowan

- 35

- 0

## Homework Statement

Light with a wavelength of 400nm passes through a 1.00x10^4 lines/cm diffraction grating. What is the second order angle of diffraction?

a) 21.3 c)56.5

b) 53.1 d) 72.1

## Homework Equations

d*sin(theta)=m* wavelength

## The Attempt at a Solution

I rearranged the equation to: Theta= sin^-1({wavelength*order}/ d)

Theta= sin^-1 (4*10^-7*2/{1/1*10^2)= sin^-1(8*10^-9)= 4.58366

Obviously, this isn't the answer. Could someone show me how to figure these problems out? I have a test coming up and i am completely stumped on all of these types of questions.