4) A laser is directed at a double-slit arrangement. If we increase the waveleng

Question

4) A laser is directed at a double-slit arrangement. If we increase the wavelength of the light, which of the following will occur to the pattern on a distant screen? -The spacing between the interference fringes will decrease, but the width of the overall diffraction envelope will increase. -The spacing between the interference fringes will increase, but the width of the overall diffraction envelope will decrease. -Both the spacing between the interference fringes and the width of the overall diffraction envelope will increase.

Explanation / Answer

Both the spacing between the interference fringes and the width of the overall diffraction envelope will increase.

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