Coherent light of frequency f travels in air and is incident on two narrow slits. The interference pattern is observed on a distant screen that is directly opposite the slits. The frequency of light f can be varied. For f = 5.60 x 1012 Hz there is an interference maximum for θ = 60.0°. The next higher frequency for which there is an interference maximum at this angle is 7.47 x 1012 Hz. What is the separation d between the two slits?

Coherent light of frequency f travels in air and is incident on two narrow slits. The interference pattern is observed on a distant screen that is directly opposite the slits. The frequency of light f can be varied. For f = 5.60 x 1012 Hz there is an interference maximum for θ = 60.0°. The next higher frequency for which there is an interference maximum at this angle is 7.47 x 1012 Hz. What is the separation d between the two slits?

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