H2P-223

Measuring wavelength with a grating

H2 Physics · JC 1 · Hard · Measuring wavelength with a grating

A diffraction grating has

5.0\times10^{5}

lines per metre. It is illuminated normally by monochromatic light of wavelength

5.0\times10^{-7}\,\text{m}

. At what angle from the central maximum is the first-order maximum observed?

Use

d = 1/n

and

d\sin\theta = m\lambda

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