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Question
Monochromatic light of wavelength 650 nm falls normally on a slit of width 1.3 x 10-4 cm and the resulting Fraunhofer diffraction is obtained on a screen. Find the angular width of the . central maxima.
Solution
λ = 650 × 10-9 m
d = 1.3 × 10-4 cm
= 1.3 × 10-6 m
`theta = lambda/"d" = (650 xx 10^-9 "m")/(1.3 xx 10^-6"m") = 0.5 "rad"`
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