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Three lights of red, blue and green colour are used successively in Young's experiment. For which colour, the fringe width is maximum ?

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Fringe width = `(lambda D)/(d)`
As wavelength for red colour is maximum, fringe width is maximum for red colour.
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MODERN PUBLICATION-WAVE OPTICAL-Revision Exercises (Very Short Answer Questions)
  1. Will there be an interference pattern on the screen if the slits in Yo...

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  2. Distinguish between interference and diffraction of light.

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  3. Three lights of red, blue and green colour are used successively in Yo...

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  4. What wil be the effect on the fringes, if Young's double slit experime...

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  5. What will be the ratio of slit widths if the amplitudes of the light w...

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  6. What is the effect on the interference fringes in Young's double slit ...

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  7. What are coherent sources ? Define interfernece of light. Obtain the c...

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  8. What are coherent sources of light ? Why nointerference pattern is ob...

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  9. State the postulates of Huygens' wave theory.

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  10. What is the condition for diffraction to take place ?

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  11. Why diffraction is better experienced in sound waves than in light wav...

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  12. What will be the effect on the width of the central maxima if the slit...

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  13. Why light waves cannot show diffracton around hills and tall buildings...

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  14. How does the angular separation between frings in single-slit diffract...

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  15. State one defect of Huygens's wave theory.

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  16. In case of diffraction from a singel slit, if red light is replaced by...

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  17. What is the condition for the nth secondary minima in case of diffract...

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  18. Which quantity associated with light wave sets the limit of ability to...

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  19. (a) Distinguish between unpolarized light and linearly polarized lig...

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  20. Define resolving power of an optical instrument.

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