Question

❤hola ❤

Q. A slit of width a is illuminated by white light the first minimum of red light with pole at theta is equal to 30 degree what will be the a? ​

Answer 1

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a sin theta = m × lemda

= m × lemda / sin theta

= 1 × (6.5×10^-7)/ sin 30

= 13× 10^-7 m

= 1.3 micron

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Answer 2

Answer:-

(sin θ = n λ ) and ( n = 1)

(sin θ = λ / a)

(a = 6000 )

(10⁻¹⁰ m )( 2 = 1.2 μ meter )

(sinθ = (n+1/2)) λ/a and ( n = 1)

(a = 3/2 '' λ / sinθ = 1.8 μm )