Wave Optics (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 18  22 of 64
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Question number: 18
» Wave Optics » Young's Double Slit Experiment
Question
The intensity of the light coming from one of the slits in a young’s double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.
Choices
Choice (4)  Response  

a.  9: 1 

b.  34: 1 

c.  4: 1 

d.  16: 1 

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Question number: 19
» Wave Optics » Wavefront
Question
When a wave of wavelength 0.2 cm is made incident normally on a slit of width 0.004m, then the semiangular width of central maximum of diffraction pattern will be
Choices
Choice (4)  Response  

a.  0° 

b.  30° 

c.  60° 

d.  90° 

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Question number: 20
» Wave Optics » Young's Double Slit Experiment
Question
In Young’s double slit experiment, white light is used. The separation between the slits is b. The screen is at a distance d (d > > b) from the slits. Some wavelengths are missing exactly in front of one slit. One of these wavelengths is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 21
» Wave Optics » Huygens' Principle
Question
In an interference pattern, at a point we observe the 16 ^{th } order maximum for λ _{1}= 6000A. What order will be visible here if the source is replaced by light of wavelength? λ _{2} = 4800 Å
Choices
Choice (4)  Response  

a.  40 

b.  20 

c.  80 

d.  10 

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Question number: 22
» Wave Optics » Polarization
Question
Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 ^{0} with each other. What fraction of incident unpolarised light is transmitted?
Choices
Choice (4)  Response  

a.  37.5 % 

b.  27.5 % 

c.  57.5 % 

d.  17.5 % 

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