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Two beams of light having intensities I and 4I intefere to produce a fringe pattern on a screen. The phase difference between the beams is `pi // 2` at point A and `pi` at point B. Then the difference between the resultant intensities at A and B is

A

2I

B

4I

C

5I

D

7I

Text Solution

Verified by Experts

The correct Answer is:
B
`I_(A)=I+4I+2sqrt(4I^(2))cos((pi)/(2))=5I`
`I_(B)=I+4I+2sqrt(4I^(2))cospi=I`
So difference `I_(A)-I_(B)=4I`
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ALLEN-WAVE OPTICS-Exercise 5 B (Previous Years Questions)
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  2. In the ideal double-slit experiment, when a glass-plate (refractive in...

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  3. In the below diagram, CP represents a wavefront and AO and BP, the cor...

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  4. In YDSE, bichromatic light of wavelengths 400 nm and 560 nm are used...

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  5. In Young's double slit experiment intensity at a point is ((1)/(4)) of...

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  6. In the Young's double slit experiment using a monochromatic light of w...

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  7. In a Young's double slit experiment, the separaton between the two sli...

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  8. A light source, which emits two wavelengths lambda(1)=400 nm and lambd...

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  9. While conduction the Young's double slit experiment, a student replace...

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  10. Fig. shows a surface XY separating two transparent media, medium 1 and...

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  11. Fig. shows a surface XY separating two transparent media, medium 1 and...

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  12. Fig. shows a surface XY separating two transparent media, medium 1 and...

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  13. A coherent parallel beam of microwaves of wavelength lambda = 0.5 mm f...

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  14. The Young's double-slit experiment is done in a medium of refractive i...

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  15. A glass of refractive index 1.5 is coated with a thin layer of thickne...

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  16. A vessel ABCD of 10 cm width has two small slits S(1) and S(2) sealed ...

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  17. A point source S emitting light of wavelength 600 nm is placed at a ve...

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  18. In a young's double slit experiment, two wavelength of 500 nm and 700 ...

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  19. A Young's double slit interference arrangement with slits S(1) and S(2...

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