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Chapter 35: Q. 40 (page 1018)

Modern microscopes are more likely to use a camera than human viewing. This is accomplished by replacing the eyepiece in Figure 35.14 with a photo-ocular that focuses the image of the objective to a real image on the sensor of a digital camera. A typical sensor is 22.5 mm wide and consists of 5625 4.0@mm@ wide pixels. Suppose a microscopist pairs a 40* objective with a 2.5* photo-ocular.
a. What is the field of view? That is, what width on the microscope stage, in mm, fills the sensor?
b. The photo of a cell is 120 pixels in diameter. What is the cell’s actual diameter, in mm?

Short Answer

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Step by step solution

01

Part (a) step 1 Given Information

That is, what width on the microscope stage, in mm

02

part (b) step 2 Calculation

The photo of a cell is 120 pixels in diameter.

03

part (c) step 3 Simplify

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Most popular questions from this chapter

An astronomer is trying to observe two distant stars. The stars are marginally resolved when she looks at them through a filter that passes green light with a wavelength near 550 nm. Which of the following actions would improve the resolution? Assume that the resolution is not limited by the atmosphere.

A. Changing the filter to a different wavelength. If so, should she use a shorter or a longer wavelength?

B. Using a telescope with an objective lens of the same diameter but a different focal length. If so, should she select a shorter or a longer focal length?

C. Using a telescope with an objective lens of the same focal length but a different diameter. If so, should she select a larger or a smaller diameter?

D. Using an eyepiece with a different magnification. If so, should she select an eyepiece with more or less magnification?

Mordern microscopes are more likely to use a camera than human viewing. This is accomplished by replacing the eyepiece in figure $35.14$ with a photo-ocular that focuses the image of the objectives to a real image on the sensor of a digital camera. A typical sensor is $22.5 m m$ wide and consists of $5625 4.0 μ m$ wide pixels. suppose a microscopist pairs a $40 X$ objectives with a $2.5 X$ photo-ocular

a. what is the field of view? That is what width on the microscope stage in $m m$ fills the sensor?

b. The photo of a cell is $120 p i x e l s$ in a diameter. what is the cell's actual diameter in $μ m$ ?

A microscope with a tube length of $180 m m$ achieves a total magnification of $800 X$ with a $40 X$ objectives and a $20 X$ eye piece. The microscope is focused for viewing with a related eye. how far is the sample from the objective lens?

A 2.0-cm-tall object is $20 c m$ to the left of a lens with a focal length of $10 c m$ A second lens with a focal length of $15 c m$ is $30 c m$ to the right of the first lens.

a. Use ray tracing to find the position and height of the image. Do this accurately using a ruler or paper with a grid, then make measurements on your diagram.

b. Calculate the image position and height. Compare with your ray-tracing answers in part a.

Mars $(6800 k m d i a m e t e r)$ is viewed through a telescope on a night when it is $1.1 \times 10^{8} k m$ from the earth. Its angular size as seen through the eyepiece is $0.50 °$ , the same size as the full moon seen by the naked eye. If the eyepiece focal length is $25 m m$ , how long is the telescope?

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