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

Question

Quizplus · Accepted Answer

In the equation, d stands for the slit separation, which is the distance between adjacent slits on a diffraction grating. The other variables in the equation are: 
- θ, the angle between the incident light and the normal to the grating surface
- λ, the wavelength of the incident light
- m, the order of the diffraction line (the integer number that indicates which bright spot on the screen corresponds to which diffraction angle)
So, d is the only variable that represents a physical characteristic of the grating itself, and is therefore the best choice for the answer.

In the Equation D Sin θ\thetaθ = M λ\lambdaλ For the Lines of a Diffratction Grating D Is: A)

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