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A micture of light, consisting of wavele...

A micture of light, consisting of wavelength 590nm and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the scree. The central maximum of both lights coincide. Further, it is obseved 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:

A

393.4nm

B

885.0nm

C

442.5nm

D

776.8nm

Text Solution

Verified by Experts

The correct Answer is:
C
`y_(3)=y_(4)`
or `(3xxDxx590)/d=(4xxDxxlamda)/d" "thereforelamda=442.5nm`.
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DISHA PUBLICATION-WAVE OPTICS-EXERCISE-2 : CONCEPT APPLICATOR
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  2. Two ideal slits S(1) and S(2) are at a distance d apart, and illuninat...

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  3. A micture of light, consisting of wavelength 590nm and an unknown wave...

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  4. The central fringe of the interference pattern produced by the light o...

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  5. Figure shows two light rays that are initially exactly in phase and th...

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  6. In young's double slit experiment the slits are illumated by light of ...

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  7. In a double slit experiment, the two slits are 1 mm apart and the scre...

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  8. In a Young's double slit experiment, the two slits act as coherent sou...

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  9. In Young's double slit experiment, the fringes are displaced index 1.5...

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  10. There are two plane mirrors. They are mutually inclined as shown in fi...

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  11. In the ideal double-slit experiment, when a glass-plate(refractive ind...

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  12. A thin glass plate of thickness is (2500)/3lamda (lamda is wavelength ...

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  13. In Young's double slit experiment, wavelength lambda=5000Å the distanc...

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  15. A broad sources of light of wavelength 680nm illuminated normally two ...

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  16. A thin film of soap solution (mu(s)=1.4) lies on the top of a glass pl...

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  17. In Young's double slit experiment shown in figure S1 and S2 are cohere...

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  18. In a Young's double slit experiment, the separation between the two sl...

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  19. A beam of light consisting of two wavelength 6500Å&5200Åis used to obt...

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  20. Fig, here shows P and Q as two equally intense coherent sources emitti...

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