KEAM 2019 Physics and Chemistry Paper

Key idea Angular position of n th minima in single slit diffraction by a monochromatic source is given by
α‌sin‌θn=nλ
(n=1,2,3...)
Where, λ= wavelength and α= slit width
As we know, ‌‌sin‌θn=‌

nλ

α

So, for first minima i.e., n=1
So, for first minima i.e., n=1
⇒sin‌θ=‌

λ

α