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For a wavelength of 490 nm, a diffraction grating produces a bright fringe at an angle of 23°. For an unknown wavelength, the same grating produces a bright fringe at an angle of 34°. In both cases the bright fringes are of the same order m. What is the unknown wavelength?

Bright fringe m
(unknown wavelength)
Bright fringe m
(known wavelength)
Central bright fringe
02
(m = 0)
Bright fringe m
(known wavelength)
| Bright fringe m
(unknown wavelength)
Screen
Diffraction
grating

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