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  4. Monochromatic light of wavelength 580 nm is incident on a slit of width 0.30 mm. The screen is 2 m from the slit. The width of the central maximum is

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Q. Monochromatic light of wavelength $580\, nm$ is incident on a slit of width $0.30 \, mm$. The screen is $2\, m$ from the slit. The width of the central maximum is

Wave Optics

Solution:

$W=\frac{2 D \lambda}{a}$
$D=2 \,m , $
$a =0.3 \times 10^{-3}\, m$
$\lambda=580 \times 10^{-9}\, m$