91影视

For the first minima in the diffraction pattern,

$\mathit{a}\mathit{s}\mathit{i}\mathit{n}\mathit{胃}\mathbf{=}{\mathit{m}}_{\mathbf{1}}\mathit{位}$

The angular locations of the bright fringes of the double-slit interference pattern is given by,

$\mathit{d}\mathit{s}\mathit{i}\mathit{n}\mathit{胃}\mathbf{=}{\mathit{m}}_{\mathbf{2}}\mathit{位}$ 鈥︹�� (1)

Here, d is the slit separation, and a is single slit width.

For the 1^st minima$m_1=1$, then rewrite the equation (1) as follows.

localid="1664273954467" $a\sin 胃=位$ 鈥�.. (2)

From the equations (2) and (3),

localid="1664273961623" $$\begin{gathered} m_2=\frac{d}{a} \\ =\frac{0.30脳{10}^{-3}\text{m}}{46脳{10}^{-6}\text{m}} \\ =6.52 \end{gathered}$$

The seventh maximum occurs at localid="1664273966471" $m_2=7$, this means there are only 6 maximums in each side with a central maximum atlocalid="1664273971604" $m_2=0$.

The number of complete bright fringes will be as follows.

localid="1664273976726" $$\begin{gathered} n=7+6+0 \\ =13 \end{gathered}$$

Therefore, the number of complete bright fringes appear between the two first-order minima is 13.