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Chapter 35: Q. 8 (page 1016)

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.

Short Answer

Expert verified

smaller f-numbered lens

Step by step solution

01

Step1. Given Information 

We have given that , parallel light rays focus to the smallest possible spot.

02

simply

The minimum Width is given by,ωmin≈2.44λfD

Also f-number=,hence⇒ωmin≈2.44λ×(f-number)

Hence smaller f-number is used.

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Most popular questions from this chapter

Mordern microscopes are more likely to use a camera than human viewing. This is accomplished by replacing the eyepiece in figure 35.14with 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 22.5mmwide and consists of 56254.0μmwide pixels. suppose a microscopist pairs a 40Xobjectives with a 2.5Xphoto-ocular

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

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a. What eye condition does Ellen have?

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

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