Wave Behavior C.3 Refraction Diffraction Superposition Interference (id: 62a728b

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 student carried out an experiment using a laser beam incident on double slits with negligible widths. An interference pattern is observed on a distant screen.


Which of the following is correct for the pattern observed on the screen when the slits of non-negligible widths are used with the same slit separation?
I. It is modulated with the single slit diffraction effect
II. Central maximum is brighter
III. Fringe spacing is larger

A. $I$ only
B. $II$ only
C. $I$ and $II$
D. $I$, $II$ and $III$


参考答案:  C


本题详细解析:
Explanation:

The single slit diffraction effect can not be ignored when slit width is not negligible. Therefore, there will be modulation of the interference pattern. Greater slit widths allow more light reach to screen and makes the fringes brighter. The fringe width is dependent on wavelength, slit separation and distance between screen and slits. None of them have changed. Therefore the fringe width is not affected.

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