A light of wavelength 6000 Å is incident on a single slit. First minimum is obtained at a distance of 0 . 4 cm from the centre. If width of the slit is 0 . 3 mm , then the distance between slit and screen will be

Question

A light of wavelength 6000 Å is incident on a single slit. First minimum is obtained at a distance of 0 . 4 cm from the centre. If width of the slit is 0 . 3 mm , then the distance between slit and screen will be, 1 . 0 m, 1 . 5 m, 2 . 0 m, 2 . 3 m

MARKS App · Accepted Answer

Using a sin ⁡ θ = n λ Or a × x D = n λ or a = n λ × D x Or D = a × x n λ = 3 × 10 - 4 × 4 × 10 - 3 1 × 6000 × 10 - 10 m = 2.0 m

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