The pattern produced by red light passing through two very narrow slits has been reproduced at right.
In each part below, suppose that a single change were made to the original apparatus. For each case, determine how, if at all, that change would affect the pattern on the screen. Sketch your predictions in the spaces provided.
1. the distance between the slits is decreased (without changing the width of the slits)
2. the screen is moved closer to the mask containing the slits
3. the wavelength of the incident light is decreased
4. the width of each slit is decreased (without changing the distance between the slits)
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