Answer:
The angle is 1.33°.
Explanation:
Given that,
Distance [tex]d=84\times10^{-6}\ m[/tex]
Wavelength = 650 nm
Number of fringe = 3
We need to calculate the angle
Using formula of angle for brightness
[tex]d\sin\theta=m\lambda[/tex]
[tex]\theta=\sin^{-1}\dfrac{m\lambda}{d}[/tex]
Where, d = distance
[tex]\lambda[/tex] =wavelength
m = number of fringe
Put the value into the formula
[tex]\theta=\sin^{-1}\dfrac{3\times650\times10^{-9}}{84\times10^{-6}}[/tex]
[tex]\theta=1.33^{\circ}[/tex]
Hence, The angle is 1.33°.
