The first diffraction minimum due to the single slit diffraction is seen at θ = 30° for a light of wavelength 5000 Å falling perpendicularly on the slit. The width of the slit is

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(3) 10×10⁻⁵ cm. a sin θ = λ ⇒ a = λ/(sin 30°) = 2λ. λ = 5000 Å = 5×10⁻⁵ cm. a = 10×10⁻⁵ cm.

The first diffraction minimum due to the single slit diffraction is seen at θ = 30° for a light of wavelength 5000 Å falling perpendicularly on the slit. The width of the slit is

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