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Angular width of central maxima in the F...

Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will be

A

4200 nm

B

420 nm

C

800 nm

D

320 nm

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The correct Answer is:
B
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RESNICK AND HALLIDAY-INTERFERENCE AND DIFFRACTION -PRACTICE QUESTIONS (Linked Comprehension)
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  2. The figure shows the interference pattern obtained in a double-slit ex...

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  3. The figure shows the interference pattern obtained in a double-slit ex...

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  4. Angular width of central maxima in the Fraunhofer diffraction pattern ...

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  5. Angular width of central maximum in the Fraunhoffer diffraction patter...

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  6. An initially parallel cylindrical beam travels in a medium of refracti...

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  7. An intially parallel cyclindrical beam travels in a medium of refracti...

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  8. An initially parallel cylindrical beam travels in a medium of refracti...

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  9. When waves from two herent sources, having amplitudes a and b superimp...

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  10. When waves from two herent sources, having amplitudes a and b superimp...

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  11. When waves from two herent sources, having amplitudes a and b superimp...

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  12. When waves from two coherent source of amplitudes a and b superimpose...

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  13. When waves from two herent sources, having amplitudes a and b superimp...

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  14. Consider the situation shown in fig. The two slits S(1) and S(2) place...

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  15. Consider the situation shown in fig. The two slits S(1) and S(2) place...

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  16. Consider the situation shown in fig. The two slits S(1) and S(2) place...

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  17. A lens of focal length f is cut along the diameter into two identical ...

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  18. A lens of focal length f is cut along the diameter into two identical ...

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  19. In a modified Young's double-slit experiment, source S is kept in fro...

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  20. In a modified Young's double-slit experiment, source S is kept in fro...

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