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In a YDSE with two identical slits, when...

In a YDSE with two identical slits, when the upper slit is covered with a thin, perfectly transparent sheet of mica, the intensity at the centre of screen reduces 75 from its initial value. Second order minima is observed to be above this point and second order maxima below it. Which of the following cannot be a possible value of phase difference caused by the mica sheet ?

A

`(pi)/(3)`

B

`(13pi)/(3)`

C

`(17pi)/(3)`

D

`(11pi)/(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`I'=(3)/(4)(4I)=3I`
So `4I=I+I+2Icosphiimpliescosphi=(1)/(2)impliesphi=(pi)/(3)`
But value should lie between `3pi` & `6pi`
So it cannot be `(pi)/(3)`
for second minima `phi=3pi`
for third maxima `phi=6pi`
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ALLEN-WAVE OPTICS-Exercise 1 (Check your Grasp)
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  3. In a YDSE with two identical slits, when the upper slit is covered wit...

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  4. Light wavelength 650 nm is incident normally upon a glass plate the gl...

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  10. Phenomenon of diffraction occurs

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  11. Diffraction of light is observed only, when the obstacle size is-

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  13. All fringes of diffraction are of-

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  14. A single slit of width d is placed in the path of beam of wavelength l...

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  15. Direction of the first secondary maximum in the Fraunhofer diffraction...

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  16. Angular width of central maximum of a diffraction pattern on a single ...

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  17. Red light is generally used to observe diffraction pattern from single...

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  18. Calculate angular width of central maxima if lamda=6000Å,a=18xx10^(-5)...

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