A grating is illuminated with light from a red laser ( = 630 nm), producing a di

Question

A grating is illuminated with light from a red laser ( = 630 nm), producing a diffraction pattern on a screen W = 2.5 m away in which the first diffraction maximum is spaced 0.55 m from the central diffraction spot. A second laser with an unknown wavelength is then used with the same grating and screen, and the first diffraction maximum is found to be h = 0.40 m from the central diffraction spot.

(a.) The spacing d between the slits for this grating = 2.93e-06, so what is the wavelength of the second laser?

Explanation / Answer

for all other factors are same,,, h is directly proportional to wavelength

=> required wavelength = 0.40 x 630/0.55 nm = 458.2 nm

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