Physics

Diffraction Grating Calculator

Find the diffraction angle from a grating.

Calculated Output

Diffraction angle (°) 19.269

Formula: d·sinθ = m·λ

Step-by-Step Breakdown

1. Values used:

2. Lines per mm = 600 /mm

3. Wavelength = 550 nm

4. Order m = 1

6. Diffraction angle = 19.269°

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The math behind it

d·sinθ = m·λ, where d is the slit spacing (1 ÷ lines per metre) and m is the order.

600 lines/mm, 550 nm, order 1 → about 19.3°.

Why do gratings make rainbows?

Each wavelength diffracts to a slightly different angle.