A parallel beam of light of wavelength 600 nm is incident normally on a slit of width a . If the distance between the slit and the screen is 0.8 m and the distance of 2 nd order minimum from the centre of the screen is 1.5 mm, calculate the width of the slit.

Question

A parallel beam of light of wavelength 600 nm is incident normally on a slit of width a . If the distance between the slit and the screen is 0.8 m and the distance of 2 nd order minimum from the centre of the screen is 1.5 mm, calculate the width of the slit., 9.2 × 10 -4 mm, 6.4 × 10 − 4 m, 6.32 × 10 − 6 mm, None of these

MARKS App · Accepted Answer

Given λ = 600 nm = 600 × 10 − 9 m. = 6 × 10 − 7 m D = 0.8 m , x = 1.5 mm = 1.5 × 10 − 3 m , n = 2 , a = ? ∵ a x D = n λ a = n λ D x = 2 × 6 × 10 − 7 × 0.8 1.5 × 10 − 3 = 9.6 × 10 − 4 1.5 = 6.4 × 10 − 4 m

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