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92 fringes are obtained in the definite ...

92 fringes are obtained in the definite distance R on screen by Young's double slit experiment using sodium light of `(lambda = 5898Å)`.
If `(lambda=5461Å)` is used, how many fringes will be obtained in the same distance ?

A

62

B

67

C

85

D

99

Text Solution

Verified by Experts

The correct Answer is:
D
Here `lambda_(1)=5898Å, lambda=5481Å, n_(1)=92`
Now `R=n_(1)barx_(1)=n_(2)barx_(2)`
`:. (barx_(2))/(x_(2))=(n_(2))/(n_(1))` and by Young.s experiment
`barx_(1) prop lambda_(1) and barx_(2) prop lambda_(2)`
`:. (barx_(1))/(barx_(2))=(lambda_(1))/(lambda_(2))`
`:. n_(2)=n_(1)xx(lambda_(1))/(lambda_(2))=92xx(5898)/(5481)`
`:. n_(2)=99`
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KUMAR PRAKASHAN-WAVE OPTICS-SECTION-D (MULTIPLCE CHOICE QUESTIONS (MCQS)) (MCQS FROM DARPAN BASED ON TEXTBOOK)
  1. A glass plate of thickness d and refractiv index n is placed on the pa...

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  2. In the Young's double slit experiment, the slits are 0.4 cm apart and ...

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  3. 92 fringes are obtained in the definite distance R on screen by Young'...

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  4. In Young's slit experiment, if the distance between two slits is halve...

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  5. In the Young's experiment, when a plate of thickness lambda and refrac...

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  6. In a Young's experiment, the width of one of the two slits is double t...

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  7. Young's double slit experiment is made in a liquid. The 10th bright fr...

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  8. If the two slits in Young's double slit experiment have width ratio 1:...

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  9. The phenomena of light passes through sleet and bends at edges of slit...

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  10. ...... found the phenomena of diffraction.

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  11. Proportion of diffraction by slit .......

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  12. If (lambda)/(a) gt 1. , then amount of diffraction

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  13. Condition for maximum diffraction is

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  14. .... can't be explained by ray optics.

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  15. If diffraction pattern obtained by using violet light instead of patte...

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  16. The central fringe of diffraction pattern obtained by single slit for ...

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  17. Condition for nth minimum in single slit diffraction is ...... where n...

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  18. Condition for n^(th) maximum in single slit diffraction is ..... where...

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  19. Formula of linear width of central maximum in diffraction is ........

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  20. What will be angle of first order maxima obtained by Fraunhoffer diffr...

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