A plane monochromatic light wave is incident on a double - slit as illustrated in Figure 24.4. As the slit separation decreases, what happens to the separation between the interference fringes on the screen? (a) It decreases. (b) It increases. (c) It remains the same. (d) It may increase or decrease, depending on the wavelength of the light. (e) More information is required.

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Chapter4: Diffraction
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Problem 90AP: A monochromatic light of unknown wavelength is incident on a slit of width 20 m. A diffraction...
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A plane monochromatic light wave is incident on a double - slit as illustrated in Figure 24.4. As the slit separation decreases, what happens to the separation between the interference fringes on the screen? (a) It decreases. (b) It increases. (c) It remains the same. (d) It may increase or decrease, depending on the wavelength of the light. (e) More information is required.

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