Laser light of wavelength λ is incident on a single slit. What is the maximum s
ID: 2106069 • Letter: L
Question
Laser light of wavelength λ is incident on a single slit. What is the maximum slitwidth "a" for which no minima in the diffraction pattern are observed?
(a)λ (b) 2λ (c)λ/2 (d) 1.22λ (e)πλ
The answer is C, someone explain to me why?
Laser light of wavelength λ is incident on a single slit. What is the maximum slit
width "a" for which no minima in the diffraction pattern are observed?
(a)λ (b) 2λ (c)λ/2 (d) 1.22λ (e)πλ
The answer is C, someone explain to me why?
(a)λ (b) 2λ (c)λ/2 (d) 1.22λ (e)πλ
The answer is C, someone explain to me why?
Explanation / Answer
The first minimum of diffraction pattern occurs at an angle θ given by ,
a sin θ = λ
As the slit width 'a' is reduced θ increases or the width of the central maximum increases .
when a = λ , θ = 90 . The central maximum spreads into the entire screen. There will be no diffraction pattern.
When a < λ No diffraction pattern can be observed. The uniform intensity on the screen decreases.
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