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pari786
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Hey, I have to answer the following multiple choice questions ... its relevant to my exam which is day after tomorrow. Can anyone please tell which options should be the answers and why... I don't have any clue about these. So please don't delete this post ... instead please help me to pass the exam. I'll never forget your guy's help. Thanks
Covering up one of the slits on a double slit experiment would have which of the following effects?
a. The larger pattern would get slightly smaller
b. The small pattern within the larger pattern would get slightly larger
c. The larger pattern would disappear
d. The smaller pattern within the larger pattern would disappear
e. The small angle approximation would no longer be valid
The Huygens-Fresnel principle tells us to pretend that each point of a wavefront in a slit or aperture is a point source of light emitting a spherical wave. Is this true only for points inside the slit? What if there is no slit? The Huygens-Fresnel principle really applies
1. to any point anywhere in a beam path.
2. to any point in a beam path where matter is present.
3. only in slits or apertures.
If the Huygens-Fresnel principle applies to any point anywhere in a beam path, why doesn’t a laser beam without any slit spread out in all directions?
1. Because all waves that spread interfere destructively.
2. It does spread, but the spread is so small that we normally don’t notice it.
3. We can’t apply the Huygens-Fresnel principle anywhere but in slits and apertures.
Light waves from two point-like sources arrive at the circular aperture of a telescope simultaneously. The telescope will resolve the two sources if which of the following conditions is satisfied?
1. the Fresnel approximation
2. the Fraunhofer approximation
3. the Huygens-Fresnel principle
4. the Rayleigh criterion[/FONT]
Covering up one of the slits on a double slit experiment would have which of the following effects?
a. The larger pattern would get slightly smaller
b. The small pattern within the larger pattern would get slightly larger
c. The larger pattern would disappear
d. The smaller pattern within the larger pattern would disappear
e. The small angle approximation would no longer be valid
The Huygens-Fresnel principle tells us to pretend that each point of a wavefront in a slit or aperture is a point source of light emitting a spherical wave. Is this true only for points inside the slit? What if there is no slit? The Huygens-Fresnel principle really applies
1. to any point anywhere in a beam path.
2. to any point in a beam path where matter is present.
3. only in slits or apertures.
If the Huygens-Fresnel principle applies to any point anywhere in a beam path, why doesn’t a laser beam without any slit spread out in all directions?
1. Because all waves that spread interfere destructively.
2. It does spread, but the spread is so small that we normally don’t notice it.
3. We can’t apply the Huygens-Fresnel principle anywhere but in slits and apertures.
Light waves from two point-like sources arrive at the circular aperture of a telescope simultaneously. The telescope will resolve the two sources if which of the following conditions is satisfied?
1. the Fresnel approximation
2. the Fraunhofer approximation
3. the Huygens-Fresnel principle
4. the Rayleigh criterion[/FONT]
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