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18 January, 18:49

Light passes through a pair of narrow slits with a 0.67-mm separation. It is found that the fourth bright fringe makes an angle of 0.19° with the normal. What is the light's wavelength in nanometers? Answer in nanometers

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  1. 18 January, 19:11
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    The wavelength of the light is 555 nm.

    Explanation:

    according to Bragg's law ...

    n*λ = d*sin (θ)

    n is the fringe number

    λ is the wavelength of the light

    d is the slit separation

    θ is the angle the light makes with the normal at the fringe.
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