CBSE Class 12-science Answered
when interference happens between two light waves , constructive interference occurs
if the path difference between two light waves is integer multiples of wavelength of light.
Let Δp is the path difference between light waves and λ is the wavelength of light , then we get constructive interference if
Δp = m λ
where m = 1,2,3,.............is positive integer ( m ≠ 0 ) .
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when interference happens between two light waves , destructive interference occurs
if the path difference between two light waves is odd integer multiples of half-wavelength of light.
Let Δp is the path difference between light waves and λ is the wavelength of light , then we get destructive interference if
Δp = (2m+1) ( λ /2 )
where m = 0, 1,2,3,.............is positive integer .
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Intensity of the light ray is directly proportional to the slit width. Therfore intensity of the light is more as the width of slit increases.