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Wave Optics

Question

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A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is

393.4 nm

885.0 nm

442.5 nm

776.8 nm

Solution

C.

442.5 nm

Fringe space width space equals space λd over straight D therefore space straight lambda subscript unknown space equals space 3 over 4 space straight x space 590 space nm space equals space 442.5 space nm

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