Which of the following is not an essential condition for interference?A. The two interfering waves must propagation in almost the same directionB. The waves must propagation in almost the same directionC. The amplitudes of the two waves must be equalD. The two interfering beams of light must originate from the same source

Which of the following is not an essential condition for interference?

1.	Which of the following is not an essential condition for interference?A. The two interfering waves must propagation in almost the same directionB. The waves must propagation in almost the same directionC. The amplitudes of the two waves must be equalD. The two interfering beams of light must originate from the same source
Answer» Correct Answer - C

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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 beA. `3500 Å`B. `4200 Å`C. `4700 Å`D. `6000 Å`
Find the half angular width of the central bright maximum in the fraunhofer diffraction pattern of a slit of width `12xx10^(-5)cm` when the slit is illuminated by monochromatic light of wavelength 6000 Å.
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Light of wavelength `6328 Å` is incident normally on a slit of width 0.2 mm. Angular width of the central maximum on the screen will be :A. `0.36^(@)`B. `0.18^(@)`C. `0.72^(@)`D. `0.09^(@)`
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Light wavelength 6000 Å is incident normally on a slit of width `24xx10^(-5)` cm. find out the angular position of seconds minimum from central maximum?

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