5 On a given microscope, the numerical apertures of the condenser and low-power objective lenses are 1.25 and 0.25, respectively. You are supplied with a filter that selects a wavelength of 520 nm. a. What is the limit of resolution on this microscope? 520 / (1.25 + 0.25) = 347 nm b. Will you be able to distinguish two points that are 300 nm apart as being separate, or will they blur into one? MICROBIOLOGY: Laboratory Theory & Application, Brief
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The limit of resolution (d) can be calculated using the Abbe's formula: d = \frac{\lambda}{2 \times NA} where λ is the wavelength of light and NA is the numerical aperture. Show more…
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The "limit of resolution" of a microscope is an actual measure of its resolving power (how clear the image is). It indicates the minimum distance that must separate two points in order for the microscope to enable determining that the two points are separate. If two points are separated by a distance smaller than the microscope's limit of resolution, they will blur together into one point. Assume you are looking at a specimen with a microscope that has a limit of resolution of 350 nm (a nanometer [nm] is 10-9 meters, or a billionth of a meter). Will two points separated by 400 nm appear as separate points, or will they blur together? Explain your answer.
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$\bullet$ Resolution of a microscope. The image formed by a microscope objective with a focal length of 5.00 $\mathrm{mm}$ is 160 $\mathrm{mm}$ from its second focal point. The eyepiece has a focal length of 26.0 $\mathrm{mm}$ . (a) What is the angular magnification of the microscope? (b) The unaided eye can distinguish two points at its near point as separate if they are about 0.10 $\mathrm{mm}$ apart. What is the minimum separation that can be resolved with this microscope?
A special filter has been added to the lamp of your light microscope that allows only light of wavelength 495 nm to pass through. What is the best resolution that can be obtained using this filter and the standard light microscope? (Note that the best numerical aperture in light microscopy is 1.25)
Dominador T.
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