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Dr.Brain
- 538
- 2
I want theoretical reason . When using microscopes , we can magnify the image as much as we want by adjascently using lenses in such a way that all aberrations are removed. But magnifying is not the solution , because there is something called 'Resolving' , like ability of the microscope to differentiate between two ends of a bacterium . As we magnify further , the two end points that smoothly define the boundaries of the image are smeared up and it is rather difficult to make out the two points. I think the reason is that as per Fermat's P. , the rays from both end points of bacterium take the approx. the same time to reach the focussing point , so they give approx. the same smeared images.So solution lies in making the rays from both end points reach the focussing point at different intervals.
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I found in a book that this difference in time interval for both rays should be more than one time period.
But what wonders me is that the wavelength of light is very small as compared to the instrument used, we should study light using 'geometrical optics' and not 'wave character', so what do they exactly mean by "one time period difference"?
BJ
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I found in a book that this difference in time interval for both rays should be more than one time period.
But what wonders me is that the wavelength of light is very small as compared to the instrument used, we should study light using 'geometrical optics' and not 'wave character', so what do they exactly mean by "one time period difference"?
BJ
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