Plane parallel wavefornts encounter the interference one medium and another as shown below The wave speed is different in the two media. what will happen to the distance between wavefront and the direction of travel wavefronts as the waves enter the second media?A. the distance between wavefronts remains unchanged but the directionof wavefornt changes.B. the distance between wavefronts and the direction of wavefront both remains unchangedC. the distance between wavefronts and the direction of wavefront both changed.D. the distance between wavefrontschanged but the directionof wavefornt unchanges.

Plane parallel wavefornts encounter the interference one medium and an

1.	Plane parallel wavefornts encounter the interference one medium and another as shown below The wave speed is different in the two media. what will happen to the distance between wavefront and the direction of travel wavefronts as the waves enter the second media?A. the distance between wavefronts remains unchanged but the directionof wavefornt changes.B. the distance between wavefronts and the direction of wavefront both remains unchangedC. the distance between wavefronts and the direction of wavefront both changed.D. the distance between wavefrontschanged but the directionof wavefornt unchanges.
Answer» Correct Answer - C because wave length and direction of progation changes.

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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`
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