Relation between angle of diffraction and wavelength

Relation between angle of diffraction and wavelength

Fig. 26.17 shows the usual arrangement for a diffraction grating experiment. A parallel beam of light is incident on the grating from an illuminated slit S placed at the

Relation between angle of diffraction and wavelength
Relation between angle of diffraction and wavelength

principal focus of a converging lens L!. The first order diffracted beam from the grating enters a second lens L2 which brings it to a focus in the principal focal plane. Here we get an image of the slit S which may be formed either on a white screen or else viewed through an eye lens. If we are using  onochromatic (= one colour) light, then for first order diffraction, the distances between successive wavefronts leaving the grating in the same phase will be equal to the wavelength, A.

Relation between angle of diffraction and wavelength
Relation between angle of diffraction and wavelength

 

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