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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

What is the $f - n u m b e r$ of a lens with a $35 m m$ focal length and a $7.0 m m$ diameter aperture?

A converging lens with a focal length of $40 c m$ and a diverging lens with a focal length of $- 40 c m$ are $160 c m$ apart. A $2 c m$ tall object is $60 c m$ in front of the converging 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.

Two converging lenses with focal lengths of 40 cm and 20 cm are 10 cm apart. A 2.0-cm-tall object is 15 cm in front of the 40-cm-focal-length 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.

To focus parallel light rays to the smallest possible spot, should you use a lens with a small f-number or a large f-number? Explain.

A beam of white light enters a transparent material. Wavelengths for which the index of refraction is n are refracted at angle u2. Wavelengths for which the index of refraction is n + dn, where dn V n, are refracted at angle u2 + du.

a. Show that the angular separation of the two wavelengths, in radians, is du = -1dn/n2 tan u2.

b. A beam of white light is incident on a piece of glass at 30.0°. Deep violet light is refracted 0.28° more than deep red light. The index of refraction for deep red light is known to be 1.552. What is the index of refraction for deep violet light?

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