Free Diffraction Grating Calculator
Calculate diffraction angles using the grating equation: d * sin(theta) = m * lambda.
nm
nm
Diffraction Angle
19.26 °
Diffraction Angle vs Slit Spacing (d)
Diffraction Grating
A diffraction grating splits light into its component wavelengths at specific angles.
Formula
d * sin(theta) = m * lambda
where d is the slit spacing, m is the diffraction order (1, 2, 3, ...), and lambda is the wavelength. The slit spacing d = 1/(lines per unit length).
Example Calculation
First-order diffraction of 550 nm light through a 600 lines/mm grating (d = 1667 nm).
- 01d * sin(theta) = m * lambda
- 021667 * sin(theta) = 1 * 550
- 03sin(theta) = 550/1667 = 0.3299
- 04theta = 19.26°
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