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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

393.4 nm

B

885.0 nm

C

442.5 nm

D

776.8 nm

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-WAVE OPTICS -EXERCISE - 4 (Level - I) Previous Year | JEE Main
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  2. If I0 is the intensity of the principal maximum in the single slit dif...

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  3. A Young's double slit experiment uses a monochromatic source. The shap...

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  4. In a Young's double slit experiment the intensity at a point where tha...

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

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  6. The initial shape of the wave front of the beam is

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  7. Statement-1: When light reflects from the air-glass plate interface, t...

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

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  9. At two point P and Q on screen in Young's double slit experiment, wave...

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  10. In Young's double slit experiment, one of the slit is wider than other...

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  11. A beam of unpolarised light of intensity I0 is passed through a polaro...

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  12. Two coherent point sources S1 and S2 are separated by a small distance...

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  13. As polaroid examines two adjacent plane polarised beam A and B whose p...

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  14. The diameter of a plano convex lens is 6 cm and thickness at the centr...

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  15. Assuming human pupil to have a radius of 0.25 cm and a comfortable vie...

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  16. The box of a pin hole camera, of length L, has a hole of radius a . It...

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  17. On a hot summer night, the refractive index of air is smallest near th...

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  18. In a Young's double slit experiment, slits are separated by 0.5 mm and...

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  19. Unpolarized light of intensity I passes through an ideal polarizer A. ...

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  20. The angular width of the central maximum in a single slit diffraction ...

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