11th Class Physics CHAPTER 9 PHYSICAL OPTICS Short Question Answers Below
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d sin θ = nλ………………………………….(i)
For first wavelength,
Third order image, n = 3
Equation (1) can be written as
d sinθ = 3λ1
For second wavelength,
fourth order image, n -4
λ = λ2
Again, equation (1) can be written as
d sin θ = 4 λ2
or λ1/λ2 = 1.33
Hence, the ratio is 4:3 or 1.33:1
The constructive will take place if the path difference between two waves is zero or integral multiple of wave length, that is
Path different = d = 0, λ, 2λ, 3λ + ……………………..mλ
Or in general:- d = mλ
Where m = 0, 1, 2, 3, 4, + ……………………….
b) Condition of Destructive interference:-
The destrictive interference will take place if the path difference between two waves is odd integral multiple of half wave-length.That is
path difference=d= λ/2,3λ/2,5λ,……………………….(m+1/2) λ
or d= (m+1/2) λ
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