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AP® Physics 1 & 2

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Double Slit Interference Restoration

APPH12-ZCH6FW

Red light from a monochromatic source illuminates a double slit. A student observes and measures the interference pattern on a screen.

The light is then changed to a blue monochromatic light, and the student repeats the observations and measurements. The student discovers that the bright bands are closer with the blue light.

Which of the following changes would make the band spacing increase to the same spacing as the red light when the blue light is used?

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A

Move the slits closer to the screen when shining the blue light.

B

Increase the intensity of the blue light.

C

Replace the double slit with a single slit.

D

Decrease the spacing of the slits.