physics....

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1) Yellow light is incident on a single-slit 0.0315 mm wide. On a screen 70.0 cm away, a dark band appears 13.0 mm from the centre of the bright central band. Calculate the wavelength of the light.

  • physics.... -

    tanφ = x/L =13•10^-3/0.7 =1.86•10^-2 ,
    φ = 1.06º => sin φ =1.86•10^-2.
    b•sin φ = k•λ,
    λ = b•sin φ/k =0.0315•10^-3•1.86•10^-2/1 =5.85•10^-7 m

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