Wave Behavior C.3 Refraction Diffraction Superposition Interference (id: 81e1be3

本题目来源于试卷: Wave Behavior C.3 Refraction Diffraction Superposition Interference，类别为 IB物理学

[单选题]
A coherent light is incident on a double slit tjdkqi e a( .v30c+on,fm:kcb5hat has sli9t8 i8p, kwuu)ilum; ot separation of $d$ and slit width of $b$. An interference pattern on a screen is observed. The graph shows the variation of intensity with distance from the centre of the pattern.


$S_1$​, $S_2$​ and $S_3$​ are the separations between various points on the pattern and the center of the pattern. The distance between the screen and slits is $D$. What is the wavelength of the incident light?

A. $\frac{bS_3}{D}$
B. $\frac{dS_3}{D}$
C. $\frac{bS_1}{D}$
D. $\frac{bS_2}{D}$


参考答案:  D


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