The lines in a grating are uniformly spaced at

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The discussion revolves around calculating the angular separation of second-order bright fringes for two wavelengths of light using a grating with uniformly spaced lines at 1530 nm. The initial calculations yield angles of 51.66 degrees for 600 nm and 52.03 degrees for 603.11 nm, resulting in a difference of 0.37 degrees. However, the user is uncertain about the units of the final answer, which should be expressed in milliradians (mrad). Clarification on the problem's requirements and the correct unit conversion is sought. The conversation highlights the importance of unit consistency in physics calculations.
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Homework Statement



The lines in a grating are uniformly spaced at 1530 nm. Calculate the angular separation of the second order bright fringes between light of wavelength 600 nm and 603.11 nm. Answer in __mrad

Homework Equations



Theta = sin-1 ((m*lambda*2)/(d))


The Attempt at a Solution



d = 1530 nm
m = 2
lambda1 = 600 nm
lambda2 = 603.11

Theta1 = sin-1 ((2*600)/(1530))
= 51.66

Theta2 = sin-1 ((2*603.11)/(1530))
= 52.03

Theta2 - Theta1 = (52.03)-(51.66) = 0.37

The answer is apparently wrong. Please help! I would really appreciate it. Thanks!
 
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Hi AnnieMoo,

In what units have you got the separation angle? And what is said in the problem text?

ehild
 

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