In the Equation D Sin $\theta$ = M $\lambda$ For the Lines of a Diffratction Grating D Is:
A)

Multiple Choice

In the equation d sin $\theta$ = m $\lambda$ for the lines of a diffratction grating d is:

A) the number of slits
B) the slit width
C) the slit separation
D) the order of the line
E) the index of refraction